L.L.
While i haven't had to deal with this yet, I will in two months when baby no. 2 arrives! Our older daughter will be 20 mo. at that point and takes one nap a day...
My plan is to put the swing either in the nursery or in my bedroom and let the baby nap in there...My daughter used to nap in her swing for HOURS! but it was out in the middle of the living room without a toddler running around and we were very quiet!
We have also, quite successfully, used a fan for white noise with our daughter since she can tend to be a a light sleeper and the house is small... I will do the same thing with the baby... put her down and consistent times, put the fan on and let her be...