Nice space and good service granted. Considering the overall old airport, this is an oasis. Wi-Fi works perfectly. Be aware that the lounge is before boarding and there are no restrooms inside.
AirBerlin Gold members also welcome. Apart from that, everything has already been said in the previous comments. It is better than sitting somewhere in the terminal - that's all.
Beverage selection is fine, but the food/snacks are really lacking. Half of it is just empty containers and then there’s some instant ramen noodles you can make yourself - ehh
This is a quite old lounge, no bathroom, food is like from a school cantine but worse, wifi didn't work. Its Air France so wish they had made it better... its the least when you pay 5k for business
Outside security, toilets are out of order - must take your stuff with and go to the public ones on level 0. Mediocre food but preferable to waiting after security in the cramped and hot terminal.