Regarding Swimming Pool!
Oh, I forgot that you asked for a swimming pool... Then things become clearer:
- Skip the Ritz Carlton - only a small fake pool with jetstream-pseudo-swimming (RC is next to a big traffic-crossing anyway, which you only miss when booking Tiergarten direction)
- Skip the Regent - no pool at all, only access to 500 meter further overly crowded Holmes Place fitness club with overloaded pool
- Skip the Brandenburger Hof - no pool at all, only access to some sports club outside
- Soho House only medium choice - top floor pool has brillant views over Berlin, but is only 12 meters long, so no decent laps possible
- Best choice number 1 is the Grand Hyatt with Berlins most beautiful pool - top floor, large pool, views all over Tiergarten, the Philharmonie and half of Berlin
- Best choice number 2 is Rocco Forte's Hotel de Rome with it's 20-Meter-Pool in the historic strongroom of former Dresdner Bank headquarter (that's what the hotel building was decades ago)
So it seems clear: Book either GH oder Hotel de Rome through a Virtuoso agent like DavidO, AGB or MarshKing on this forum to get free breakfast, upgrade etc.