Cordula's little flat was cute and amazing, and she is a beautiful generous person that helped us out on numerous occasions.
Our group of 7 people managed to co-exist for 7 days, and loved every minute.
Only issues were no microwave in the kitchen, and a small bathroom for our large group (Cordula let us use the downstairs bathroom when needed, so not a huge concern). The wifi doesn't reach to all parts of the attic flat, but was enough in certain areas.