Overpriced and average
This hotel is ok just for somewhere to sleep, it's a 10 min walk from the underground station so quite easy to get to.
The reception staff are lovely and helpful, however the bar service isn't good. I gave up waiting to order (I was the only customer waiting) and walked around looking for a supermarket to get food and drinks instead.
The rooms are small and very basic but again, fine just for somewhere to sleep. The only problem is they have really small duvets (and no extra bedding) so you have to turn up the noisy heating. This isn't ideal when it's minus 2 degrees in Hamburg.
This would be fine for a "budget" hotel, but at €110+ per night I think it's a big overpriced. However, I don't think you would find a better hotel for this price close to the centre of Hamburg!