I think this is a great flat for a young couple - it's in a great area. Really buzzy with lots of cool shops, cafes, restaurants etc. Also very easy to get to Alexanderplatz either by foot or tram. Communication was good throughout, flat was very easy to find, was clean enough and was in a lovely, quiet building.
For us, however, it wasn't ideal. As parents of a young child we had brought our laptop ready to watch boxsets every evening, however, the wifi is very poor, kept losing the signal and therefore we struggled to download anything. Also the stairs were a real struggle - there is nothing that could be done about this but it could've been made clearer in the listing. Overall, we would recommend, although due to our specific needs we wouldn't rebook.