We stayed for 2 nights at Miguel's. Overall I would say it was a good experience - he was ready to answer any questions we had, the appartment is in a good location (we specifically wanted to stay in Belem for the first 2 nights of our trip). It was chilly without the sun, so the place would really benefit from the double glazed windows, nevertheless, the place had two heaters and a few extra blankets, that was really helpful. Probably not a problem during summer.
Also, we missed some tips from someone local - for me, it's always an advantage of staying at Airbnb place, but, of course, it's not a real minus.