Great find, excellent location, very clean. Just repeating what one of the previous reviewer said: I would want to live in this location if I was from Porto.
Daniel is a very nice host, offered to pick me up from the station on my arrival which came very useful.
The nearest metro is about 20 mins walk ( I timed it), but please don't bother with it, because if you turn right of the house, and then left on the corner and continue walking by the underpass, you will reach the beginning of centre within 10 mins. That was my preferred route and I even regretted getting a travel card as I walked everywhere. I would highly recommend Daniel's place.