Karl is a great host. He was always interested in how he could help us to have a great trip. Sadly, some noisy upstairs tenants were throwing parties until late time in the morning. This was terribly annoying, but Karl was attentive to correct it.
As a side note, avoid Washington D.C. while a government shutdown is in place. Due to this, we found a lot of garbage in the streets and all the Smithsonian closed. Of course, this is not under Karl's control.