Exceptional

Pleasant

Liked: Good location next to the DESY campus. An excellent bakery for breakfast nearby (I did not try breakfast at the hotel, since I usually have just coffee and a croissant for breakfast).
Disliked: A super-rude receptionist who mixed up the bill -- and not only did not apologise for their mistake but was also extremely impolite. This has completely spoiled my stay. Otherwise the hotel is OK'ish: nothing fancy and a bit old but fine for a night or two.

Very good

Night staff didn’t know how...

Disliked: Staff were unhelpful

Peaceful and satisfying

Liked: The breakfast was v. Good. Good variety of options that would satisfy most people who have experienced an overnight stay at the Mercure Hotel.Fresh and tasty produce on display and well laid out.

Superb

Superb

Liked: very nice and clean hotel just outside the centre with easy parking around

Good

Liked: Well, the vibe is a bit retro by now but everything is clean and works and the beds are great and the staff is nice.
Disliked: There really isn't anything that didn't meet my expectations

Superb

Liked: Friendly staff.
Disliked: The extra bed or sofa bed was very hard and stiff to sleep on.