Maria's place is in the perfect location to enjoy Lisbon. Conveniently located closely to the main attractions or to tram/bus stops and metro, it's an ideal place for those who are visiting for a few days.
The apartment is clean and graciously decorated and, although I never met Maria, she was very responsive, helpful and flexible. I will be definitely going back when I visit Lisbon again.
Minor note: there is a nice kitchenette in the apartment, which makes it great if you are staying for a short while - if you are planning a long-term stay, the kitchen appliances may become a bit uncomfortable.