Apartment is close to the centre, all kinds of public transportation, grocery stores, couple of restaurants and cafes. It is well equiped and clean. The host is responsive and helpfull.
Bear in mind that the apartment is really small, and it can get crowded with 2, but it is managable for few days. You should be out exploring the beautiful city od Lisbon anyway 😄
Also, it is uphill, so prepare for some light cardio.