The only real experience I have is with my grandmother, but there the situation is slightly different seeing as she has Huntington's. I can say though that once we got her into a home that really worked for her and her condition, her quality of life has improved immensely. She's happy now, laughs a lot when we visit her. And before she moved there she hadn't laughed in years.
So my best advice is, if you have a choice, try and find a home that seems to fit her the best.the main thing that we where noticed when we visited the home we are at now was that the people who worked there addressed my grandmother directly, and did speak trough us others. She was the one that mattered.