If you want to see Porto, this is the place to stay. Perfectly located, clean and well-decorated. We were super well received by Valentim, the person in charge of the check-in, and the hosts were very gracious to allow us an early check-in. At arrival you are given a little brochure with a bunch of suggestions of what to do, see, etc. and they are extremely useful.
The trip was incredibly fun in part because we knew we had a cozy, very centrally located apartment to return to, with AC that could cool or warm the house to our liking, and a TV to relax and watch a movie. All in all, the only reason I'm giving 5 stars is because I can't give 6!
As an additional note, the hosts were super nice and kept in communication the whole time we were there, making sure our stay was as comfortable as possible.