I spent a week at Fermando’s place at the end of August.
The place is lovely, it’s located in a great position to enjoy Porto but also has some nice terraces if you just like to chill.
Fernando is a great host, we kept in touch during my stay and he was very helpful.
As it’s already been mentioned by other guests and by Fernando himself, you’re not allowed to use the kitchen and the bathroom is small, but those weren’t much of a problem because I’m not that big of a guy and eating out in Porto is quite cheap (of course, those things are relative).
I’m giving 4 stars out of 5 only because I found my room and the bathroom not exactly clean when I arrived, but Fernando fixed it as soon as I told him.
I don’t think you’ll find much better at the same price, considering you get a whole room to yourself.
If you’re a solo traveler, I would definitely recommend staying at Fernando’s.