Very convenient location just above Trindade metro station. City center easily reachable by foot, 15 min enjoyable walk. Very clean place, well maintained. The apartment is very small, ideal for 1 person, 2 max. Minimalistic furniture and tiny kitchen, but convenient for short stay in Porto. The apartment is part of a bigger apartment area with several doors inside. However, all managed well and no issues with the neighbors.
The apartment is facing the main and very busy street. If you have a sleeping issue, you might find yourself spending sleepless nights in there as the noise is very loud. If the owner invests money into sound proof windows, this would be an absolute recommendation for a pleasant short stay in Porto.