The apartment was located in a fantastic position in the ribeira district down near the river (a short walk from Sao Bento metro station). While we didnt get a chance to meet Paulo, he had a friend wait downstairs for us to meet us (who would have waited for more than an hour as our flight was delayed) to check us in. The apartment itself is tastefully designed and perfect for a couple. It is located on the 4th floor but there is a lift which is handy for heavy luggage. The only comment we had is that as it is an old building, it feels a bit damp and we found the towels were a bit musty after a day.
Other than that, great value for a fantastic location - would recommend staying here in Porto. Check out the wine bar on the same street further down towards river -they do a great port wine tasting!