Hi R., I am a new grandparent and I understand both sides and I agree with most of the folks, that you are lucky that they are excited about their grandson and want to spend time with him. But it is important to talk to them and let them know how you feel, that at times their presents can be too much for you, that you enjoy when they come to visit but you still need your alone time to bond and learn more about each other and it's difficult to do if your always haveing company. Unfortunatly we can be overbaring parents and grandparents at times, mostly not intentional, we want to make as many memories before an oppotunity is missed forever. You said their Son is your boyfriend, so for them it could also be an insecurity feeling, because you'll are not married, there is a sense of one day you and your son could leave, no strings attached and they are worried they may never see him for a long time, or ever again. It's Best if you discuss with them how you feel, and let them tell you their concerns as well, or they will continue, not knowing how much this is upsetting you. Don't assume they already know and are doing it to intensionally. They could also be filling a void in their own lives if they have no more of their own children still at home. It is best to set a good understanding from the begining.
However, if they are still over powering after you have spoken with them, then yes by all means do what Sherry suggested and "Tell the grandparents your trying to get your son on a new schedule and you want to start a family tradition" and let them decide which 2 days of the week is good for them, and not everyday. This way your not hurting them or as Sherry said alienating them My parents Iive in another country and I wish they were close enough for my children to have spent more bonding time with them, the way I did with my own grandparents, and yet I had to set gound rules for my in-laws to not be overbearing, but to help me as I was a very young Mother. It worked out great with me, but my brother in law and his wife feel my mother in law is too much, because my sister-in-law did not set similar boundries.
On the other hand both my husband and I have bonded with our grandson more than we probley should have. Our Son's girlfriend and her son moved in with us right as she came out of the hospital when our grandson was 4 days old and he will be 2 yrs this October. We got so close as if he was more our son than a grandson, as he slept between my husband and I since his mother worked nights. But when she came home she would kiss him or play with him if he was still awake at 2 am and then go to her room, so we have been the ones with him almost 24/7 though his every two hour feedings, burping, rocking him to sleep, changing dipers, bringing his fever down all night long while he's cutting teeth, taking care of runny noise and then making sure he gets breakfast, lunch and dinner, has his bath, etc as if he's our own son. Recently however she and our grandson moved out of state for a month to stay with her grandparents but then they moved back to Texas, but is home with her Mother, and we are all going though major withdrawals, and concern that she may be neglecting him as she did when they lived with us. But you know God is taking care of our little snuggle bug, as she has stepped up the the task and is bonding with him finally and is careing of him the way a mother should, which we prayed and knew she would as the situation changed. It is very hard for my husband and I not to want her to bring him everyday or leave him with us every weekend, and we could tell her about the things he likes and dislikes, but that is his Mother and she will learn on her own, I can offer advise, but at the end of the day, it's only advise, she has to do what's best for her and her son. And I can still pray everyday for God's hand of protection over them both. Trust me we want to be with him like before every minute of every day, and we that would make us that overbearing grandparent , it's hard to step back, but we know we have to or we could risk loosing him forever.
As for keeping your house clean, it's hard with a 2 year old around and it's a good idea to use the time he spends with his grandparents to do your cleaning, but like Amy said "If you think your house is clean enough, then smile and tell them that you appreciate their input, but that you think your house is just fine. You can also ask for their suggestion to help show you a better way to juggle a 2 yr old and keep a home spotless, but remind them its a suggestion, it may not work for everyone. Enjoy some of the Blessings you do have, and work though the unpleasentries. Good Luck.