Olivers place has everything you need, from a comfortable bed (and sofa bed) to a hot shower and a well equipped kitchen. Its modern and has a lovely little balcony lookimg over the square.
The location is quite simply as good as it gets, in a trendy lively neighbourhood with endless affordable bars and restaurants.
We made the easy 15 minute walk to a large train station for getting around although Oliver is very helpful and provides lots of information about buses and trams too which are nearer.
Check in and out is easy and a fairly late check in wasn't a problem.
I can't rate it highly enough and would defo stay again if we return to Berlin.