Great:

Fantastic location in the heart of Lisbon two min walk from the cathedral. Comfortable and clean holiday rental rather than someone's home with good air conditioning. Very helpful owners who were straight forward to deal with, who provided transport to and from airport, looking after luggage which was very useful. Though not a busy road there was quite a bit of noise from the street, people talking outside the restaurant on the ground floor and cars backing in and out of the adjacent cul de sac - fine if slept with windows and shutters shut using air con to keep cool. The noise from the main door has been mentioned in most reviews so won't raise again.
Overall great flat and had a great stay in Lisbon