“Hotel was ok but wasn't particularly convenient.”
The hotel is in the Stellingen suburb of Hamburg, which is a 20 minute train journey away from the main Hauptbahnhof train station in the centre of the city. The nearest S Bahn station is a 10-15 minute walk away from the hotel. Although it isn't too far away, it is quite difficult to do if you are carrying heavy bags of luggage. Apart from the Arena, there isn't that much to see or do in the immediate locality.
Having checked into the hotel, I found that the bath/shower was covered by some sort of black material. I wasn't impressed with having to clean the bath to remove this material.
The room itself was clean, spacious and comfortable. There is a main road outside, which was audible but not excessively loud.
The main thing that I would criticise the hotel for was finding the black things in the bath.
I would suggest staying in the centre of Hamburg, as it is a bit too far away from centre and there isn't a huge amount to do in the immediate area. It wasn't awful by any stretch of the imagination. My stay wasn't uncomfortable. I was just a little disappointed by the location.