Perfect Stay. Location is A+, only two pleasant blocks away from the Zoo entrance, like three to the Metro station and area with many options to eat from nice Cafe/grills to a 7 Eleven and CVS nearby.
The street this apartment is in is exactly what I was looking for in our visit in DC. Felt secure. I was hesitant that this being an semi underground apartment with no opening windows, but there is a back door that leads out to their back yard, this was nice, also to see the weather outside. Taxi rides averaged at about $17 from here to National Mall area. Metro was about $3 per person, so for a family of 4, I'd recommend the taxi.
Beds: A+, slept better or just as good as back home, pillows were great too, Host provided Memory foam for sofa bed and it was great.
Bathroom: Only one, small toilet, but Host provided great towels and toiletries.
Host went ABOVE and BEYOND in every aspect, provided books and media, my girls wanted to stay in and read the books instead of going out! Travel guide books too.
Cleanliness: B+, spouse is a clean freak so there is no way any apartment will meet her expectations, but I found it to be pretty clean, even with allergic kids, not one of us got sick. There was also no trace or smell of pets in the apartment, even if the host has a beautiful dog upstairs.
Dinining Area and Kitchen: were all perfect and fully stocked utensils and even some unexpected fine food was provided by the Host.
I highly recommend this apartment, and would stay here again and again.