Fantastic location, right in the heart of Porto on a busy, lively street.
As others have mentioned, the noise from the nightlife below can be heard in the apartment but we only experienced this in the twin room and it didn't bother us much - it's the price you pay for being right in the centre of the action!
The apartment is modern, well furnished and perfectly clean. Check-in instructions were clear and easy, and Pedro sent an extensive list of recommendations the week before that were really useful.
Overall a great apartment that we will definitely recommend, but just be aware it is not in a quiet part of the city.