For anyone who needs to visit the American Consulate/Embassy in Frankfurt, right now the hotel Friedberger Warte (a four star hotel across from the Consulate) has a special offer. My husband and I will both be staying there the evening of April 1st (before his visa interview on the 2nd), and we paid only 44 Euros (including all taxes) for the two of us with breakfast using the website www.ebookers.de. We actually found the rate by using www.tripadvisor.com, searching on the hotel, and then doing a rate search. Some sites advertised a rate of over 100 Euros per night, so needless to say we were quite pleased with the rate found on ebookers. Plus, the hotel looks beautiful and has free overground parking.
Anyhow, I'm not sure anyone on VJ is headed there any time soon, but perhaps in the future, they might also have a reasonable rate and it might help someone.
Best wishes,
Mary