Karl was really helpful and responsive, he provided us tips to get around Washington and he is very friendly. He even provide with the appartmant a document listing the useful places nearby (restaurant/grocery store etc). The appartment is great for a stay in Washington, spacious and clean.
The appartment is located in a residential area and a bit far (walking distance) from downtown but with an uber/taxi it's really easy to acces Union Station/Downtown (5$).
I would totally recommend staying here for any future trips back to Washington.
Thanks for hosting my family and me, we had a great time here !