Just to have a current report... six night, paid stay (originally was going to stay at Le Meredien, but checking spg.com the day before i arrived i got an internet only rate 10 euros more a night)
the hotel is beautiful... the lobby is gorgeous, the staff was extremely friendly and helpful.
The rooms were in excellent condition (my upgraded room was awesome, my coworkers non-upgraded room was just a good -- just smaller)
didn't eat at the hotel but the service at the bar was fantastic.
my one big issue... no concierge... ever. which for a hotel that size is unacceptable to me. some of the front desk staff was helpful... some of them gave me the impression that they teleported into the hotel for work from some other city and have seen nothing of frankfurt outside the hotel.