My partner and I spent 12 weeks here during the winter. It's a comfortable apartment in a good location, with terrific views in two directions. There is a remarkable amount of space, due in part to the mezzanine, which is very nice. The furnishings are somewhat spare (especially in the kitchen), but you will find most everything you need. There are 3 beds, plus the couch, which means that there is room for several people, though there are few doors, and so not much privacy. It's also a bit hard to heat in the winter. The four-walkup, after climbing the hill, was excellent conditioning for our legs!
Catarina was a nice and responsive host. When we had problems, she made sure they were addressed, albeit at Portuguese speed (we were over 4 weeks without a working dishwasher). One thing we would have liked was to be able to receive letters or packages at the apartment, but that won't be an issue for people doing shorter stays.
All in all, this is a charming place in a great location.