Carlos extremely friendly host. He waited us till midnight to check-in (late flight). Additionally he showed us some interesting places to visit in Porto.
Apartment located in 10 mins from train station and 20 mins walk to city old center.
The only one negative aspect was loud children at the morning of first day (6 am). And you should know that in general soundproof is poor.
But overall we enjoyed our stay here. Good value for the price.