I stayed at Marina's place for 5 days in May 2021.
The location cannot be beat, as it is walking distance from a supermarkets, drug store, many restaurantsand coffee shops. It's also quite easy to get public transport from there, with many buses going by. Also on the plus side, the shower got hot very quickly and the water pressure is excellent. The bed was comfortable and the apartment gets lots of light.
The apartment itself is cute and looks like in the picture. If you're just there for a few days either by yourself or as a couple, it should work if you're not planning to spend much time inside. I personally needed to work remotely during the day, and the table and stools provided in the "kitchen" are EXTREMELY uncomfortable for sitting more than 15 mins. The little chair faces nothing, except a wall, so you can't comfortably watch TV either.
The AC didn't work well for the duration of my stay and Marina was less than helpful, as she did not seem to know the system very well. Also, her messages were very curt and unfriendly. I just didn't bother to call her anymore.
Finally, if you plan to do any cooking, find somewhere else to stay because the smoke alarm is OVER THE STOVE and goes off the minute you do anything in the kitchen. I made toast. Yes, toast, and it kept going off the whole time. And no, the toast was not burnt.
Overall, the place is okay. If you're coming to experience DC and will be out most of the day, don't need to work or cook, it will be great.