Staying with Elena was great. The apartment was very clean and nicely decorated, we had a lot of privacy. She is really nice and very friendly, easy going and it's interesting talking with her.
The neighborhood is nice and you can find a lot of restaurants that have delicious food. There is a subway station very close to Elena's flat so there's no problem with transportation.
I would definitely go back and stay with her. I had a great time and I really liked her as a person.