I stayed in Ani's room for 10 days at the end of August and really enjoyed my time there. Ani herself was out of Lisbon and I stayed in her room. She lives with her roommate Rimma who was in the apartment during my stay. I can say that both Ani and Rimma are the nicest people. They helped me with all questions, made me feel welcome and gave me great recommendations for the city. I was able to have quiet time for myself and also had great conversations with Rimma.
The apartment is located in Bairro Alto where you can easily reach lots of restaurants, bars etc. ... The area can be loud in the evening, but the bedroom is facing the backyard and therefore is a bit more quiet. Also the bedroom is quite small, but has a nice bed and you can use all other rooms for example to relax on the couch in the living room or work on a separate desk.
Overall, I highly recommend staying at Ani's place and would for sure come back!