Apartment is excellent, in a renovated building with elevator (which is rare in the region). Quite spacious with coffee machine, dishwasher, washing machine, fridge and freezer. Shower in the bathroom very good too.
Location is amazing, close to all the major tourist points in Porto and also public transport. There are small markets nearby if you want to buy stuff for breakfast or cooking.
Check-in was simple, we met on the agreed time, he gave me the keys and that's it. Checkout was very simple as well.
If you're coming to Porto by car you might find it difficult to park nearby because it's a busy area with mostly narrow streets. There's a Saba parking lot 2 blocks from the apartment, but be prepared to spend quite some money if you leave your car there for a few days.
Totally recommend this place if you're going to Porto.