Due to some unexpected water problem with the apartment, Diogo called me the day before to tell me that we wont be able to stay at this apartment, but not to worry, and that we will have another one, as good as this one!
And indeed, Diogo, found us an apartment, at the same location, which was even better than than the one we booked. In addition to this, Diogo was really nice, patient enough to wait for us, take us to the flat and give us a lot of good information about Porto!
All in all, very nice host, and I would definitely book with him again!
P.S. Porto is amazing!!!