Overall, a very pleasant stay at Mario's place. The appartement is well-situated and only a short walk from most of Porto's main sights. It is clean, modern and comfortable - perfect for a short city break. The street it's on has a number of bars and restaurants which makes the evenings a little noisy but this didn't stop me from sleeping (although I did have to close the windows so a fan would have been helpful given how hot Porto was during my stay). My only real issue was that I didn't have a key for the front door to the building and, when I arrived home late one evening, the spare key in the safe was missing meaning I was reliant on a neighbour to let me in. There was also a problem with the front door to my apartment which meant I could not lock it. While not a great issue, it did limit privacy a little as others used the washing machine in the foyer. These small issues did not spoil what was, overall, a very enjoyable stay however.