Thoroughly enjoyed our stay at Miguel's place during our recent trip to Porto. Miguel welcomed us in-person and gave us a detailed introduction to the neighborhood and other points of interest in the city. He was extremely communicative and ensured that we felt at home.
The location is located on fairly quiet street, but conveniently just a 5 minute walk to the Bolhão Metro station (or a 15-20 minute walk to the main city center/river area). Porto has a pretty mild climate, but was a bit warm when we were there. We found that the apartment got a bit stuffy at night, but this probably isn't an issue for most of the year/if you don't mind leaving the windows open to cool off during the night :)
I give my highest recommendation for Miguel's place for folks traveling to Porto!