The appartment was nice, clean and much bigger than the photos suggest. It's close to the metro station in a street with some shops (good breakfast Palace opposite). It is also very central for whatever you want to do in Porto.
Check in an check out was a bit complicated as Diogo was not at the appartment at the time but once telephone contact was made everything resolved pretty quickly.
We liked Porto, we liked the appartment and we also liked Diogo. We definitely reccomend bis appartment.