My girlfriend and I stayed there for a month.
PRO: You stay right in the touristic center, yet in a quiet, small street. The apartment is clean and has everything you need. The wifi was good. Nuno is an exceptionally helpful and friendly host and you just know that you are in good hands.
CON: Although staying seemingly in the center, you are not as central as you might think if you are not just into tourist attractions, and it takes a bit of walking to get to the transport. The worst was that the walls are super thin and you hear every step from the neighbours above. In fact, make sure you align your sleeping schedule with theirs, because you might be forced to get up when they get up early. Not because they were particularly noisy, it's the architecture of the place.
For that reason I'd say: Definitely okay for a short stay, but I wouldn't recommend it for a long stay.