As lot of others state here. The SweetInn team is really supportive and kind in communication and takes care. Expect them to just contact you directly on day of arrival and not before. The building is mainly used by SweetInn, still some private ones live there and might ring your door even though you are not the root of evening / night noise. The construction of buildings in city leads to a bit more noise as mentioned by others too. There are some windows to the inner side, where also toilet and water etc go down. Also stair area gets some noise to the apartments. But this is what you need to expect when you are in the centre of Barcelona! Not worth to complain about it. Just a matter of fact. The size of apartment and rooms is fine and quite efficient. The interieur especially bath rooms not brand new but all works. If not they quickly fix it. Overall a good one to use if you are a bunch of people like we were.