Crystal's garden apartment is a 10 out of 10. It is super cute, super clean, and best of all, super convenient to everything. We stayed there with our family of 5. Mom & Dad in the master bedroom on a comfy queen, and the 3 kids in the 2nd bedroom. The 11 yr old twins shared a full size bed while teen daughter took the twin. Other than the usual complaints that the noisy twins were keeping daughter awake, they were all perfectly happy with the arrangement. Having 2 bathrooms was really helpful (we've stayed in AirBnBs with one bathroom, and with 2 adults and 3 kids fighting for toilet time, it turns ugly fast!).
The apartment is thoughtfully stocked. There are plenty of towels, there are extra sheets, there was soap and shampoo in the bathrooms, and there were even some bandaids, which was a big relief to me after I got a walking blister. The kitchen is little, and while there isn't much cabinet space, we found everything we needed.
There are a number of wonderful, family-friendly restaurants within blocks of the house, and more great shopping and dining is available just a stop or two away on the Metro. Of particular note is The Roost, an interesting dining hall place. You find a table, scan the QR code at your table, and order from a number of different restaurants all at once, on one tab. There are roaming servers who bring water and make sure you have what you need. It's busy and noisy, but everyone (including the vegan among us) was able to get food they wanted. I recommend that you check out the restaurant menus before heading down there, to streamline things. The Roost is right across the street from the Metro.
This apartment has the best proximity to the Metro of anyplace we've stayed in any city. We did a LOT of walking in the city, and having a very short walk to the house from the Metro at the end of a long day was fabulous. If you're visiting D.C. to see the museums, you couldn't ask for a better location. You're just minutes away from the Mall on the Metro. Did I mention the Metro? Yes - it is by far the easiest way to get around town. Combine it with the bus, and you can get anywhere.
We felt completely safe in the neighborhood and at all times on the Metro. If you are driving to D.C., know that parking in the neighborhood is at a premium. It's best to just park once and use... you guessed it, the Metro to get around. If you drive away and come back at 7pm you may have to really look around for a spot.
Crystal was quick to answer any questions we had, and very responsive. She has a binder in the apartment with tons of great information about the apartment and the city. I highly recommend this place and will stay there again when we're in D.C.