We had a very nice stay at this apartment in Porto. The location is very good and walkable to the water, many restaurants and shops, the train and metro, and lots of great sights. It's in an old neighborhood close to a busy tourist area and the apartment is very noisy if you leave the windows open at night. There are only two large windows at one end of the unit so it gets a bit stuffy in the bedroom when you close them; earplugs are helpful! The kitchen is small by equipped enough to make breakfasts and simple dinners.
Check-in was very easy, someone met us at the main office to let us into the building and give us the keys. However, the management company was not very responsive to us when we had some issues. The bed frame was very bent and two of the legs were almost completely broken to the point that we didn't want to sleep on the bed in case it fell down. We notified Go2oporto about this and they eventually told us that they weren't going to be able to fix it, so we just slept with the mattress on the ground and the bed frame leaning against the wall; they did give us a partial refund for the inconvenience, but my emails went unanswered for days even with several reminders. We also got back one afternoon to find out that someone had been in the apartment to clean it without our knowledge; we had arranged a time with Go2oporto for the cleaners to come by, but then they came again unannounced. We appreciated coming back to a clean apartment but were frustrated by the disregard to our privacy; Go2oporto did not respond when I mentioned this to them.
All in all, we enjoyed the apartment and its eclectic decorations, and its location is very convenient, but we were frustrated by how much time we spent dealing with our hosts. Hopefully they replace the bed soon!