The downsides are small but will likely be niggling: no dishwasher, four flights of stairs to walk up. I imagine I'll get used to the latter, and I've lived without a dishwasher before so I know I can do it. I'll just make my guests do their share of washing dishes when people come for Shabbat. -g-
Of course, the big downside (if you can call it that) is that I have to move in on Feb. 1, which is Real Soon Now. I think it's going to be a busy couple of weeks!