Pros.
We have rated this 5 because, for the price, it is a great option. This is our second stay in city-room, Berlin. The apartments are a great choice for a holiday or short term stay - especially if you have children. Not only do the cooking facilities mean that you don't have to eat out all the time, it is in 'trendy' Prenzlauer Berg district, which is extremely child friendly (lots of playgrounds nearby, child friendly cafes and kids shops). Close to lots of shops for everyday needs and more. Close to S-Bahn and U-Bahn to get in and around city easily. Host is friendly and helpful. Price is good too.
Cons
We also didn't have a washing machine this time (as someone else said in their review) but it has worked OK as whereas last time we washed the stuff ourselves and it took ages to dry, this time we let them know we need some washing done and it is taken away, washed and dried and returned to us free of charge. Cooking facilities are limited (2 cooking rings) but fine for short stay and have all the pots/pans/plate/cutlery etc we need and toaster, kettle and dishwasher as well as fridge & coffee maker.
Overall, recommend city room apartments highly.