My partner and I stayed at Ricardo's place for 5 nights.
The apartment was exactly as described in the ad. It was spotless, spacious and check-in/check-out was smooth.
In terms of location, the apartment is easy to reach by public transport. Walking to the old town of Porto takes about 20min.
There are several restaurants, cafés and supermarkets within 5min walking distance of Ricardo's place. If you have a car, there is paid parking in the street (free after 7pm).
Communication with Ricardo was always friendly and helpful.