Great host, great apt, great location.
The location is close to lots of good bars restaurants, parks and public transportation. A good base for exploring Porto.
The apartment had everything you need, but small though. Not a problem at all for two travellers. Good view to the Carmo church and nice light. The road outside isn't that busy but the surface of the road is noise when cars and busses runs by. Expect some noise from the outgoing people on Friday and Saturday night. Wasn't a problem for me however, slept like a baby. And I'm normally picky. The kitchen is well equipped for cooking a dinner.
The host is everything you wish your airbnb host to be. I cannot praise him enough. His recommendations was good and made Porto an even better place for us.
Conclusion : will recommend and rent again if I'm in Porto.