I would recommend this place to anyone wanting to stay and see Lisbon. The old part of the city is very walkable (obviously has some hills ;) but no problem for people which are good on foot). The stairway in to the apartment is a bit steep but was no problem for us. The place is clean and had everything we needed. It was a nice looking apartment.
If I am planning to go back to Lisbon I will for sure try to see getting the same unit again.