Overall the flat was as described, and Mario was very quick to respond and an EXCELLENT host. However, the pictures show the apartment being a bit newer then it actually was when we arrived. I also didn't like how the halls were pitch black when we arrived which provided an uneasy feeling for a female traveler. Also, perhaps my fault - I assumed the apartment was on the ground level floor (first floor in the United States) - No Fault of the host! But, we had to lug heavy luggage up about 30 steps.
Porto seems to be a younger crowd (College type of city), which is great for young travelers. However, having traveled all day I wasn't happy hearing the residents coming home from local pubs in the middle of the night.
Overall, Mario was an excellent host but the flat could use a some lift. I would suggest for young travelers looking for a budget room.