foreigner

I'm travelling to FRA next week for six days. I need to be in Cologne but the hotels are very, very full. Some rooms are available but at exorbitant rates.

I just wonder if I am better off staying near Frankfurt airport and commuting back and forth on days 2,3,4,5. Maybe day 6 also.

I understand the high speed ICE trains take about 60 minutes to get to Cologne.

What do you think?

And one more thing...about ticket cost. There are 3 of us. Can we buy Four day or Five day pass at discounted prices?