Company decided to cut costs so we had to find a decent option, well located and for a budget price.
67 euros/night in Goethplatz made this hotel an option.
The room I got was almost new. Modern design, similar to the Cocoon hotel (same group). But I've heard that some other rooms are older and not so nice.
Didn't try the breakfast.

The rooms were nice looking with modern furniture (I had a Mediterranean room with windows to the courtyard), the bed was comfortable, but the service and the restaurant could be better and it would also have been nice to have a minibar and a possibility to have tea in your room. I and my colleague also saw a mouse running on the floor of the restaurant when we had breakfast.

Been in this hotel for 3 nights with my wife & 7 years old son.
Friendly & helpful staff. The rooms however have seen better days. Although an adequate size, they need refurbishing, especially the bathroom. The bathroom is very small and had a lot of mould-spots, and some parts of the tap where broken and no water-pressure.
Location is very good 2 min walk to underground train, and a quiet neighborhood.
Breakfast was very good there were plenty meats, cheeses, boiled & scrambled eggs, bread an Espresso/Macchiato coffee machine and more

My husband and I have stayed in Herzog for a week. Thanks to the reviews posted here on Tripadvisor we requested a room on the court side - it was no problem to get it.
I liked the decoration of the hotel, a lot of different spots to hang out and relax. They do serve delicious food; dinner price is comparable to other restaurants of that class but don't waste your money on breakfast. Yes, it is a buffet and it is good but for 9 euros per person you can feed a family of four in the coffee shop just down the street.
I would definetely stay there again. Stania (sp?), one of the front desk staff members was especially nice.