The apartment was very spacious, comfortable and nicely furnished with all the equipment you could want, including a washing machine and tumble dryer. It is in a quiet street and well located for the main Berlin sights, with the Museum Island and St Nicholas quarter being about a 15 minute walk. The nearest underground station was only a few minutes walk away.
It's not in the prettiest part of town, and apart from the hotel restaurant, you have to walk for 5-10 minutes to get a variety of restaurants.
They have obviously listened to reviews about wi-fi access and you can now obtain 3 hours for 3.50 euros.