The Spa at Pullman Berlin Schweizerhof
The spa at Pullman Berlin Schweizerhof is referenced by those who travel for a living. Out of 5 reviews that we monitored, 2 acknowledged the spa, like Oyster and The Telegraph.
Pullman Berlin Schweizerhof 
Oyster
The Telegraph
Oyster "There's also a spa with a sauna and Turkish bath"
The Telegraph "Located close to the Berlin Zoo and Tiergarten, the Pullman offers great amenities for business and leisure travellers that span a decent restaurant and bar, a 24-hour business centre and – the real highlight – a comprehensive spa that has the largest indoor hotel pool in Berlin"
