Bought this just before leaving for Berlin and found it really useful. Nice and handy due to its small size, it fits in your pocket. It is based around neighbourhoods which we found really practical and we used it to explore many neighbourhoods during our trip.
If you want a guide with more information about sleeping options you need to get the bigger Berlin guide, but for a practical guide to take with you during the day this is the best.
Would like to see it updated regularly though as the info on visiting the Dome on the Parliament building is out of date, amongst other things.