Stayed at Sofia's place for five days, and I had a wonderful time! Sofia was kind enough to let me drop my bag off early before official check in. She also provided a lot of resources to help me get around the neighborhood, and was very responsive when I had questions while I was there. The apartment is located between two central lines in Lisbon, which made exploring the city easy. Fair warning though: the apartment is on the top floor of the building with no lift, so if you have heavy bags you will have to carry it up a few flights of stairs but the trip is well worth it!