Carlos is possibly the best AirBnB host I've encountered so far. Very warm, helpful, and a fount of knowledge about the local area (and a bit further afield). Do take him up on the offer if he wants to cook for you; it is worth it.
In terms of the room, it is spacious enough and cozy. There is a large chest of drawers and a closet for hanging clothes, as well as a desk which was fine to work remote from. It's a great location with excellent views, and easy walking distance to a number of great areas in central Lisboa.