My 2023 RS Germany guide book has this to say about the Hackescher Markt area in Berlin: "Unfortunately, there's a dearth of recommendable hotels in this area; all three listed are bigger than they are charming."
To me, a huge component of "charm" is a universally friendly and helpful staff. We arrived at the Adina Apartment Hotel Berlin Hackescher Markt late, and I mentioned to the front desk clerk that we were starving and would be out looking for food after we checked in. He s said, "I'll take care of your bags, go eat now and check in after you eat". He gave us the easy directions to the lively Hackescher Markt, where most, if not all, of the restaurants were still open. This level of service continued throughout our entire stay - at times offering more help than we needed.
The breakfast buffet is extra, and nothing is made to order. We were down for breakfast as soon as it opened, and with the exception of hash brown potato patties on one day, everything was at least warm. There was some variation in the daily offerings.
Our studio "apartment" was actually pretty big, laid out "shotgun" style with a small kitchen, with dinnerware, a few pots and pans, a 2 burner stove, microwave, sink, refrigerator, and even a small dishwasher. I don't know if there was a conventional oven - didn't look. There was a desk and chair next to the closet at the back of the room. We had a sofa, a small dining table, and good-sized tv. The mattress was nice and firm.
The bathroom had a walk-in shower with half a door. Just make sure the shower is pointing down and away from the wall.
The carpet was clean and odorless, although there were a few stains, as mentioned in some reviews. Maybe that qualifies as charm!
I will be writing a trip report soon, but I wanted to post a rave review of this hotel as soon as I got home.
https://adinahotels.com/en/apartments/berlin-hackescher-markt/