We were three adults and three kids (10, 9 and 4) and we stayed for a week.
The short review: great location, beautiful apartment, excellent host communication, we'll stay here again.
The long review: The place is one block off the 14th street corridor that is now the hippest and most lively place in DC. Singles, couples, and families can easily find plenty of places to eat, shop and visit in the Logan Circle/14th Street neighborhood. The apartment is a short walk to CVS, Whole Foods or Trader Joes, and if you need to carry lots of groceries the Whole Foods has an indoor parking garage. We shopped at Whole Foods a few times during our week long stay.
From this location, we easily accessed Capitol Hill, the monuments on the National Mall, Smithsonian museums, Virginia (for Mt. Vernon & Old Town Alexandria), the National Zoo, etc. Central, convenient location.
Street parking was surprisingly easy. We were able to park either directly in front of the apartment or less than a block away every single day. DON'T FORGET to stick the parking pass the host gives you in the windshield. I forgot one night and now I owe DC $30.
The apartment was stunning to walk into. It is a basement unit but it does not feel like one. You should be aware that in DC, the rowhouses all have ground level and basement unit apartments. So this is not what you think of when you hear basement unit. The place looks like it was renovated last week and is decorated like a model home for a catalog. Very pretty. The master bedroom is especially large and pretty and has a bathroom en suite.
The second bedroom is well sized and has a new looking full hallway bathroom. The kitchen/living room area is well laid out and useful. We prepared breakfast every day in the kitchen and ate out for lunch and dinner, but you could easily prepare any meal of the day there.
The living room has a fold out sofa that comfortably slept our two older kids. No problem. In total, we slept six people in the unit and it did not feel cramped at all.
We had to communicate with the hosts a few times before and during the trip and they answered extremely quickly and were super polite and nice to work with.
We had a great time and will definitely stay here again the next time we are in DC.