The Bar/Lounge at Grand Hostel Berlin
Grand Hostel Berlin's bar/lounge is acknowledged by expert writers. Out of 4 publications that we monitored, 3 endorsed the bar/lounge, like Lonely Planet, Oyster and The Telegraph.
Grand Hostel Berlin 
Lonely Planet
Oyster
The Telegraph
Lonely Planet "Cocktails in the library bar? Check"
Oyster "There's a hip library bar just off the lobby, and a restaurant and snack bar on-site too"
The Telegraph "There’s a bar and library room on site, and the staff are young, friendly and international"
