Just returned from 6 night stay in Hotel Abendstern.Reception staff were polite and helpful.Bus,train and underground stations all very near so you can be in central Berlin in a few minutes,for a 2.70 Euro single ticket,or 7 Euros for all day travel.I walked everywhere as it is not really far from the hotel to the centre by foot.Single room was simple,clean and tidy and quite adequate for a single traveller.Breakfast provided cereals,rolls,cakes,cheese,eggs and sausages and although nothing fancy,again it was quite sufficient to start the day in a good way.The area has some good bars and restaurants,with a shopping area just round the corner.Hotel provides good,clean service at a very reasonable price.If you want more comfort.you will have to go elsewhere(and pay a lot more)but for a short holiday such as I had,it is ideal.If I am ever in Berlin again,I will stay in the Abendstern.