Good choice.
Might as well relax and enjoy your stay.
I'm about 3 hours away, so I can't help much, but if you do need help with something send me a private message and I'll give you my cell phone number.
I think you should be fine though. I even think Lufthansa might pick up some of the hotel bill. I read they have to refund the full ticket price for those who didn't fly.
Good luck.
Thank you and we may need your advice as time goes on. We have not gone to airport to try to make arrangements to rebook, we will wait until airport opens so we can deal with actual facts. We fear we will be here forever, we all have jobs to get back to and animals that are being cared for by others. We still are unable to get through to Lufthansa so waiting.
Visiting Cologne tomorrow by train. Just wasting time but trying to search happy things to do.
Good night.