Verónica is the kindest, most generous host. She waited in the apartment while we followed very bad directions and searched for it for almost two hours with heavy packs. It is very close to the tower, you just need to orient yourself correctly in order to find it. Verónica gave us a map and marked points of interest on it. She explained everything well and recommended we try various things in Porto, like the tram ride along the river, etc.
The apartment is perfect and on ground level. The location is excellent. Porto is very hilly so be prepared for that.
I would definitely try to stay here again next time I visit this wonderful place.
P.S. - Two days are not enough!