Casa da Hera is exactly as in the photos - very stylish and comfortable, with nice bottle of local wine to welcome us (which sadly we did not get time to drink as so many great places to dine out)! We loved the location - an easy stroll to restaurants and bars of Ribeira and port cellars of Gaia.
Carlos was very quick to respond to emails with advice about travel from airport and check-in was easy (a friend met us and showed us around the house).
I would just mention two things - first it was very noisy at night, just general street noise (mostly the refuse guys who were the noisiest I have known!) but we did not mind this too much. Second, this is the first time we have stayed in an AirBnB property and there was NO info about the local area, places to shop for essentials, restaurant recommendations (didn't stop us enjoying our stay at all as most things on doorstep but would have been helpful).
We loved our stay at Carlos's house and would definitely try to book again if visiting Porto (which is likely as it was really beautiful, relaxed and fab sunny weather even at end of October).