Pros:
The apartment is big, spacious and comfortable. The balcony is nice and quite. There is a garden to park bikes, really useful. The location is good, close to Ostkreuz station and M13 tram.
Cons:
As written on the apartment page: no wi-fi, and the check-in (5pm) is a bit late (if you arrive in the morning you have to deal with your luggage all day).
Also: we were given 1 key only, with no option for a second pair. That could be a minor annoyance if you are a group of friends.