If you love cats (like we do) and to be in a place where smoking is allowed (in the living room) then Rui and Sergey's place is ideal. The bedroom was clean and with a very beautiful view of Porto. The bathroom was right outside of the bedroom and very clean. We had heating. And Rui and Sergey are very nice guests that shared tips about the city and made us feel welcome. The location is very good in Gaia (only 2 Metro stations or a 15 minute walk over a beautiful bridge and you're in the middle of everything).