Finally got sorted.
Going out on 12th, back on 20th. There for vs Germany and vs Switzerland.
12th Stuttgart
13th to 16th Munich
16th to 20th Siegburg
Anyone looking for accomodation for Cologne, have a look at Siegburg. Its right between Cologne and Bonn with great transport links, trains about 30 mins and run through the night. We are in Hotel Oktopus in Siegburg and there seems to be plenty rooms available.