I went to porto with my girlfriend. The apartement is absolutely perfect for two people, and 5mins walking time away from bolsao station.
The place was easy to find and the check-in and check-out went without any problems.
The apartement is quite fancy and very clean&tidy.
On top David & Claudia were extremely nice hosts and gave us many good recommendations for things to do and places to eat.
In short: Probably one of the best apartements and hosts in you can have porto for two persons.