I stayed at Gabriela's apartment for a month and LOVED it.
This is the best apartment to stay in Lisbon. The location is perfect, you have everything you need in walking distance and Gabriela is the perfect host.
Gabriela was so accomodating, the place was always clean and she regularly reached out to check that everything was OK. I also got locked out one night (she provides 2 sets of keys but I left them both in my room!). She ever so kindly came to let me back in, which was really appreciated, as she was actually spending time in another city!
This is the only place I would consider to experience Lisbon!