Me and my boyfriend stayed in Joana's apartment for a couple days and a half. Joana wasn't in Porto in those days but her mother welcomed us in the apartment and gave us really usefull tips for our stay in Porto and she was very nice to us and available if we needed something. I found Joana was very nice too, even if she wasn't there fisically she cared about us being ok with the vacation and the apartment. The apartment also was really nice and comfortable, we found we had everything we needed and the position was really good, near to a lot of interesting things to visit and place were you can eat good food at a low price; we just had a little sink drain problem (it was a little slow) but we told Joana and she let us know she would fix it, so again I found her very nice and correct. So I would really recommend her apartment if you are going to stay in Porto!