Tiago's place is located just a 2-minute walk from the Santa Caterina viewpoint, walking distance from all the major sights, close to several supermarkets and near plenty of fun cafes. Santa Caterina is quite possibly the best area to stay in if you want to walk everywhere, though you're also super close to the famous Tram 28 and other modes of transport.
Tiago himself is friendly and always quick to respond. He regularly checked in to see that everything was okay and made super I was comfortable. I highly recommend staying at his place.