The room is clean, well-appointed, and well-lit, with a good view from the 10th floor. The flat itself is not located in Porto proper, but across the Douro river, in Vila Nova de Gaia - count 10 minutes or so to the metro station, a little longer (down a steep street) to the riverbank near the wine cellars.
If you are the sort of traveller who likes very detailed instructions on what places you should see, as well as several optional add-ons like breakfast or a guided tour (for a fee) that Manuel will offer as soon as you step into his flat, then this is the place for you.