I liked very much staying at Mike's place.
The location is just perfect: right in the center by the Bolhão and rua Santa Catarina, in front of the tube station with direct connection to the airport. This is unvaluable!
The flat is spacious, super quiet and clean, comfortable, with light, and I was lucky enough to get the room witn the terrace, which is a really wonderful extension of space in the open air.
Comunication with Mike was simple, his messages were very quick, clear and efficient.
I definitely recommend this place to any traveler who wants to enjoy the Porto experience!