Great location, close to Sao Bento train and metro station. Bus from the airport has its final destination close to the apartment. Lots of local busses also leave or pass close to the apartment. The apartment appeared even slightly bigger than indicated in the photos. Storage room is not overwhelming, but was ok for the two of us. Would even work out for three.
Apartment on 4th floor had a great view over Porto. We were fortunate to enjoy a great week during summer time at temperatures above 30 degrees Celsius. Apartment is equipped with air condition which enables decent temperatures in-house. A minor challenge - given the extraordinary temperatures - was getting up the 68 stairs to the 4th floor, particularly as you walk uphill to reach the building most of the time (depending where you come from). Not a big deal and only an issue if you are short of breath. We loved it.
Surrounding offers a great variety of nice bars and restaurants within very short walking distance. Very close to Clérigos Church, the tallest church in Porto. We were not bothered at all by the church bells - that hardly clock by the way - as indicated by another comment.
Hot water in the shower was easily sufficient for the two of us (could not agree to one former comment).
Excellent and quick communication despite missing personal contact because of Covid-19. Regarding Corona we felt very safe in Porto. Everybody is very disciplined and disinfection is almost obligatory prior to entering into bars and shops.
Could not think of a better location.