Very good stay, the apartment is large, clean and very well placed. We didn't meet Daniel but he is very accomodating: we were able to leave our bags in the apartment as soon as we arrived in Porto and back wainting our flight.
Be careful though: there is only a very small window in the apartment (in the bedroom) and two skylights in the living room. This is not disturbing for a very short stay but it is very dark and it is therefore necessary to turn on all the lights.