The accommodation has significant pros and cons.
The pros: Although I did not meet Alex during my visit, he responds quickly to emails. The home is clean and stylish — Alex was even generous about me checking in early (as timing happened to work out). The room offers most of the bare necessities for a short one-night stay in DC.
The cons: The home is located in a rough neighbourhood. Although I never felt unsafe, it was surreal to see many boarded up houses as I walked to the accommodation from Union Station.
Overall, please use your discretion. As Alex is a nice host, I would not discourage anyone from checking out this listing.