Karl is an excellent host - we never got to meet him, but the stay was generally seamless without him around. Also, he is very responsive with responses always coming in within a few min.
Also, the place was clean and ready for us when we arrived. We also never had issues finding parking in the area.
We however thought the place had a bit more room based on the pictures than it did. The bedrooms are quite small with a trundle bed in each room that allows for 2 people per room.
Also, the place is right by Florida Ave which is quite a busy street. The noise level is dramatically reduced once the door is closed but you can definitely hear the traffic outside.
All in all if you're a couple of people this would work well for you.