I travelled with my sister. Sérgio was a fantastic host. He picked us up from the airport and gave us a little introduction to the city by making a car trip with us. He is very friendly, funny and gave us a lot of useful hints. You share his apartment with him but he really doesn't make any restrictions, you can use anything. The apartment is clean and lies in the heart of Alfama which is the perfect location to discover the lovely city of Lisbon. If I ever come to Lisbon again I will definitely will try to live at Sérgios apartment again and I recommend you to do so as well.