We stayed for two weeks in Liliana and Carlos' 1st floor apartment and were very happy there. Liliana and Carlos are the sweetest and most helpful hosts. They have a shop downstairs, so they are always available to help or ask questions. The location could not have been better! Just a few blocks to the river, Sao Bento train station and so many important Porto sites. There are tons of restaurants, bakeries, and shops, just outside the door. there are a couple of little mercados for groceries within a few blocks as well. You can walk to almost everywhere, and public transportation is close by if you want to go further out.
The apartment was very clean, nicely furnished, comfortable, and well equipped. We enjoyed having the little courtyard for some private outdoor space. Because we had so much stuff (10 weeks in Portugal) and there was somewhat limited storage space in the bedroom and bathroom, it was a bit of a challenge organizing all our things, but for a shorter stay (or if you have less stuff) this apartment is perfect.
You really can't find a better location, a nicer apartment, or sweeter hosts, than this one in Porto. I highly recommend it.