Highly recommend this place, it is perfect for two travellers. Location is close to everything and walkable - however, Ueber cannot drop you off or pick you up in front of the door due to traffic regulations. Very quiet and clean apartment, had a good night sleep though the bed and pillows were on the hard side.
Communication with the hosts could not have been better and they provide a lot of information.
It is very hilly in Lisbon und tricky to walk with heavy suitcases from the subway to the apartment but it is doable. Only thing to mention is that the stairs leading up to the apartment are rather steep as described by the hosts.