I highly recommend staying at Maria’s flat! It is very clean, surrounded by various restaurants and cafes, and has an easy access to various tourist spots. We had an open communication with the host our whole stay through phone, and he was very hospitable and willing to assist us if needed. The flat will have another guest room, but we still had a good privacy. I think it is a great value for money, considering that many other guest houses for the same price in Lisbon requires you to share the space with 4 or 5 other guest rooms. One of my top Airbnb experiences!