Great experience! The place is located just next to the old city, which is perfect. I didn't meet Valentina in person, but her husband Vadim was really nice and easy-going.
I'm gay and I told them beforehand that I was coming with my boyfriend and it was not an issue at any point, I didn't feel judged or anything, they are open-minded (so is Prague in general, it seemed to me). I highly recommend it!