A nice flat with 5 rooms, like a little hostel. The flat was clean and the stay was very well organized. We reached the appartement with Marios description easily.
We only stayed for one night in the hostel, so we couldn't use the flat in it's whole.
The room was good, especially clean. For me the most important aspect. The bathroom was clean as well. The balcony is great. The flat is located in the center of porto. That is much comfortable. You don't need five minutes to get into the real city.