We (8 people) had a great time in Porto and got a lot of local tips what to see and what to do. For that the apartment manual was perfect with all info you need. And if something wasn't in there, Filipe or Susana helped out. They were very friendly and courteous. The apartment is very well located. We went everywhere on foot because there is pretty much everything within walking distance. The apartment itself was clean and as described.
Only the possibility of heating was a bit limited.
All in all we would recommend the apartment.