We stayed at Joao's appartment for a whole month and we had a great time there! It's small, but very comfy and lovely decorated. Also it feels very special to live inside the castle walls - the hills are sometimes challenging, but then again you can't walk through Lisbon without climbing some hills. The only small negative point about the appartment is that there's very little sunlight, but with all the lamps you can light everything perfectly. Communication was great, Silvia and Joao were always ready to help whenever we needed something. I would definitely recommend this place.