Helena's flat is cozy&beautifully furnished. Now it's my favorite city thanks to her kindness & beautiful home. I felt comfortable, like in my own home. She prepared some fruit, water and 2 bottles of wine for us which we really enjoyed. The view was great and next to the beautiful Basílica da Estrela. Although it is a little bit away from most of the other tourist attractions, it is still not so far (30mins walk to the Rossio station, 10mins by bus&tram) and the neighborhood is attractive. I believe staying in a lively community is a better option than the central area or where hotels are packed if you want to savor the city. The elevator went out of service during the stay but we are in our 20s..so wan't a big deal.
Overall, I would definitely stay at Helena's home again.