T.F.
Does it have to be an apartment? Many hotel companies have one or more suite type of hotels available for semi long term stay. They have 2 bdrm or so with full kitchen set up.
Some off the top of my head are Candlewood Suites, Fairfield Suites (owned by Marriott), Homewood Suites and Embassy Suites (owned by Hilton) and many others.
Just a thought. Good luck finding something!