After spending two weeks in this house, the unfortunate conclusion is that I cannot recommend this place to other visitors.
While there are definitely some positive things to mention (a spacious room, quick communication with the hosts, the washing machine and dryer were excellent) the cons ultimately outweigh the pros. As previous guests have already mentioned in their reviews, the internet is shockingly bad (often I could not conduct a simple voice call or using the Uber app because the WiFi was too weak). Much of the furniture is old and worn out (the bed is in dire need of replacement, for example). The place also needs a deep clean.
There are some negatives beyond the control of the hosts, but they are nevertheless of relevance to potential visitors. First, the house is quite far from both the Fort Totten and the George Ave-Petworth metro stations, about a 30 minute walk to each. Second, the neighbors on the right keep a dog in their yard which barks incessantly and often disturbed my sleep, even when using ear plugs. Again, this is beyond the control of the hosts but can influence the comfort of guests.
During my stay there was unfortunately a dead rat in the backyard of the house which the owners refused to clean up. It slowly disintegrated during the rains that followed. This was not very pleasant to look at.
I should stress that I certainly did not have a horrible stay, often it was quite pleasant. And I particularly appreciated the use of the kitchen, which was fully equipped. All in all I think this place could improve with a few adjustments, but at the moment I would not recommend it to others.