I could not recommend anymore than this! Excellent location (from our window we could see the Porto Music Hall), less than 5 min walking from Casa da Música metro station, which itself is no further than 10 min from Porto Historic Centre.
Excellent place: nice, bright and spacious. Everything was very clean.
One of the hosts, João, was keen in making our stay complete by showing us the main touristic features and landmarks of Porto.
We even receive a bottle of wine as a treat. :)
If you have any doubt about booking this place, do not hesitate on doing it so.