The apartment is very good and perfectly clean. It's an apartment with four rooms, big kitchen and dining area, two bathrooms. My room was rather big, with table and a couch, small balcony. Two bathrooms is enough for four rooms, I didn't have any problems with shared spaces. Kitchen is full of everything you need to cook, except some essential products like salt or oil which you wouldn't by each time in every apartment. The location is convenient, metro station is just around the corner, many bus routs also. Big supermarket is 5-7 min walk, small shop is two steps from the building.
I didn't see Graça and only once met Tiago for a second, so it's more about having your place to stay in Lisbon (and very good place), but not about communication with locals like it can be with Airbnb experience sometimes. Although hosts are always available for questions, answer immediately and trying to help you as they can.
So, resuming, it's a very good place to stay if you don't need to be in the heart of tourist life in historical center. I recommend it for sure.