My husband and I booked Carlo's apartment for our weekend break in Porto, to escape London for a few days. The apartment was just as described and we weren't disappointed. Very cute area and very clean and cute apartment. Jorge (the lovely guy who met us and showed us the apartment) gave us some good tips on places to visit and eat, and they had even left us a bottle of red wine to enjoy. The apartment was lovely and in a great area (Ribeira) and this time of year, it was quiet but still had a nice buzz about the place.
Unfortunately, on our second night the neighbours upstairs had a party that went on until around 4am. With an apartment with original features like lovely hardwood floors, this unfortunately meant that we could hear every single thing. Dancing, jumping up and down, furniture sliding around and dropping on the floor, shouting, music, etc, we didn't sleep at all. This combined with some construction work happening outside of the apartment early the morning before meant we just hadn't slept much on our trip, so we checked out a day early and into a hotel nearby for our last night as we had an early flight home. Jorge was very responsive and very apologetic, and we understand there was nothing they could have done about this. They kindly refunded us our last night, although we hadn't asked (nor expected) this. They didn't have to do this, and the gesture was very much appreciated.
All in all, I would definitely recommend the apartment and for the most part the place is very quiet!