The Restaurant at COSMO Hotel Berlin Mitte
COSMO Hotel Berlin Mitte's restaurant is referenced by professionals. Of the 5 reviews tracked on TripExpert, 4 endorsed the restaurant, like Fodor's, Oyster and The Telegraph.
COSMO Hotel Berlin Mitte 
 Fodor's
 Oyster
 The Telegraph
 Star Service
 "Scent restaurant offers a breakfast buffet as well as an international menu with local and organic dishes" 
 "Located across the street from the Spittelmarkt U-Bahn stop (the trains can be heard in lower-floor rooms), the boutique-style hotel is a 10-minute walk to Museum Island and Alexanderplatz, making it a convenient choice for art and architecture lovers, although there aren’t many restaurants or bars in the immediate area" 
 "Cosmo also boasts a chic restaurant, and decent buffet breakfasts" 
 "Hovering above the restaurant, the minimalist corner bar doubles as an airy breakfast room, and rates include the healthy buffet spread"