My partner and I had a lovely stay at Gonzalo's place. Gonzalo met us at the station near the apartment (having given us exact instructions of how to get the tube from the airport to where he would meet us - the underground system in Lisbon is easy!). He showed us the supermarkets and restaurants and was only a text away during our whole trip; he made sure we were enjoying ourselves and recommended more places when we asked. The apartment is lovely and fairly modern, situated on the 3rd floor in an old apartment block on top of one of Lisbon's many hills. It has a fully equipped kitchen so cooking in the apartment is easy, although my partner and I found Lisbon quite cheap so ate out for our whole stay. We 100% recommend Gonzalo's place, it's a great base for seeing the sights of Lisbon :)