advantages:
+great location (most highlights are in walking distance, metro is close by too)
+very calm
+clean
+spacious
things to improve/disadvantages:
-no windows
-no cupboard in the bathroom
-slow internet
-cooking is not recommended (no steam vent)
-communication could have been better
All in all, a few small things ought to be changed to make a stay more comfortable. I would recommend this place though, if you stay for only one or two nights.