In general, We had a great time staying in Mathieus flat. For the price it’s an awesome deal. The location is simply superbe (everything is within 10 minutes walking distance). Also Mathieu was a wonderful host providing us with lots of useful advice and information. The flat is neatly furnished although you have to realize the 4th bed is actually a very old sofa. In addition, the rooms do not have heating so at night it gets quite cold.
However, if you’re looking for a budget solution in the heart of Porto it’s definitely worth a look.