I was happy to had a short trip to Porto few days ago (right the day before of St João Day). And it was absolutely great!
Location of the apart-s: yes, it's a little bit noisy outside (because of the square and cafe/restaurants on the first floor) but for us it was a plus, we didn't excpect the total silence. And to be honest: what do you excpect from the classic port city?
As for me location is great, walking distance to everywhere (except Atlantic Ocean) but taxi is cheap anyway.
Rui is a great host with positive vibes at all. He also has a bar so you can pass a little if you want. In all terms he did our time in Porto comfortable and we didn't think about nothing but our free time.
If I will back to Porto I will definitely check his availability for these days.
So thank you Rui! aalll goood to you!