Hamburg is not a difficult city in terms of traveling, however we can say the hotel is a bit out of the city. It's recommended if you are driving as they offer free parking.
The internet is working over coupons, while it's unlimited the speed is limited to 512kb making it a trouble to watch a video on youtube. If you keep you business attitude, make sure that you know it.
There are bad reviews about the food but the restaurant is definitely worth trying, a decent chips with a huge cheeseburger is about 10 euros.
While everything seems to be custom built for the hotel, everything seems to have a design sense from Ikea or Habitat. That's not how I think of a design hotel, I think of more upscale furnitures but everything looks clean and yes, there is a design sense for sure.
I wish rooms had air conditioning and I wish all rooms had a minibar. The first time I stayed here, I had XL room with a minibar, the second time I stayed at an M room with no minibar and my third time was at a L room with no minibar.
Just so you know all rooms are huge and M rooms are as big as L rooms. Don't pay any extra for a bigger room, I can easily tell that the rooms equal to three times of an average Parisian hotel room.
There are bikes and Mini Coopers to rent which is good and they offer you a free beverage when u check-in where I have only been offered for once, on my second check-in.