I stayed one month in Ana & Mariana's apartment. Its centrally located in one of the historical districts of Lisbon. Mouraria is (thankfully) not fully gentrified and you can mix with a variety of local residents, and tourists alike. The flat is extremely bright, tastefully decorated and has all things you could possibly need for a long stay (I would highlight a washing machine). Overall I was pleased with my stay and with the contacts I had with Ana. She was really helpful.