Carl's house is terrific! It is quirky and artistic and a really wonderful place. It is full of fascinating things from around the world, including animal skins hanging on the wall. So, if that bothers you, just be aware.
Everything was clean and comfortable. The kitchen is under construction, but it was cleaned up and no construction was being done on the weekend while we were there.
Carl was very clear in his communication with us. He mostly kept to himself and gave us our privacy, but we enjoyed chatting with him on Sunday afternoon before we left.
The neighborhood is great, with lots of fun cafés and restaurants right around the corner. It's about a 15 minute walk to the Metro.
I'd definitely stay there again next time I'm in the area.