Hi,
I know your post is old, but better late than never.
I recommend the following site:
https://www.casasparticulares.net/frThere, the houses are ranked based on quality, and the owner’s friendliness is one of the most important factors. Don’t let bad experiences discourage you—there are excellent options in Cuba.
I was really disappointed by the attitude of several casa owners in Havana during my last trip. The welcome was often cold, the owners seemed to have pesos instead of hearts, everything was counted—next thing you know, they’d charge you for the air you breathe. Ugh...
Do your research before picking a casa! And take advantage of the tips from forum members who’ve had better experiences than I did!
Personally, I was so put off that I’m not sure I’d stay in a casa in Havana again.