Afonso's place is in an amazing location right in the old town - perfect for exploring the city and truly feeling like a local.
The apartment is well designed and very tasteful, but bear in mind it doesn't have central heating so was a bit cold for a December stay. They do provide small space heaters for each room, but overall, keeping warm in the winter here is quite a commitment! Afonso was very responsive to our requests for firewood (he even brought another batch when the first batch proved a bit too wet to burn in the fireplace) and once we had the wood, the living room and room directly above was toasty.
There is construction next door that starts at 8 am, so we were awakened a bit earlier than we would have liked - but it might be worth asking if this is still going on. Overall we still had a great time in Porto.