Carlos' place is superb. The apartment is situated behind the St Catarina shopping street and within walking distance to many places of interest in Porto. The room itself is spacious and bright. The bed is very comfortable. Carlos himself is a super host. He kindly helped me with my luggage (fyi the apartment is on the 2nd floor and there is no elevator in the building). He gave me a map of Porto and many recommendations on places and food (non touristy ones). I did not bother to go to the tourist information centre.