I stayed for 3 days in Lisbon. Check in went super well and check out was very convenient too. Raquel's apartment is comfortable and in a great location: Bairro Alto. It's close to a lot of the attractions and at night it is next to where everyone hangs out, including some great fado restaurants: O Faia and Toca do Chico.
There is a set of stairs to get to the 2nd floor apartment, however that was not an inconvenience for us, besides it is the reality of most Airbnb apartments in the area.
I would recommend her apartment and would stay there again.