We had a very good stay at Thierry's apartment. It is very well located between a metro station and not too far away from the Sao Jorge castle by foot. You need to take a few stairs to get to the flat and it is located in a hill you reach via cobblestony streets (Lisbon generally is very hilly and cobblestony). The flat itself does not have a window with a view, but it has a lovely little outdoor terrace that is shared with other guests. Thierry was very easy to communicate with before and during the stay. The flat has everything you need to set up a base and go explore Lisbon, we'd recommend it.