Things have, for better or worse, changed pretty dramatically, at least from my experiences. I've been in Russia with my partner for about 3 years now, and we've lived in St. Petersburg, Moscow, and for a brief time, in Pereslavl.

While the apartments aren't huge by comparison to most houses in the US, they are pretty comfortable, though the quality will vary depending on the particular building and region you live in. Most of the buildings appear to be the same that were built during the USSR, it's just the internals were remodeled with more modern amenities.

It can take a little getting used to, living in somewhat cramped quarters, but for me anyways, I've always had fairly small places to live growing up, whether it was living in a 3 bedroom with 6 people in college, my cheapo first apartment, I guess it's more just something you get used to. Even now, my partner and I live with her mom/aunt in a 3 bedroom apartment in SPB and, aside from occasionally stumbling across each other in the kitchen and funny battles for the bathroom, we get by just fine.