My husband, daughter, two grandchildren, and I just returned from a six-night stay at the Executive Club Suites in Arlington. We had a two-bedroom apartment, with kitchen, living room, and one bath. The master bedroom was very spacious, the second bedroom small, the living room (with queen pull-out sofa) was comfortable, but not huge. There were two TVs -- one in the living room and one in the master bedroom.
This is a great place for families who need a safe, convenient, child-friendly place to stay while sightseeing in the DC area. The apartment was clean, well-equipped (right down to the dishes, pots and pans, and silverware), and felt very safe. The apartment, while too small for five people to live in, was perfect for our needs -- we really just needed a place to sleep, shower, and eat a couple of meals each day. We saved a bundle by taking advantage of the continental breakfast (cereal, fruit, danish and donuts, and juice; coffee, tea, cappuccino and hot chocolate were available all the time) and by cooking our own dinners. In late afternoon/early evening, there were soft drinks and snacks in the lobby, and on Tuesday evening the staff provided a spaghetti dinner with meatballs, fresh salad, and bread. (This was a wonderful surprise for us, since we'd been sight-seeing all day and were hot, tired, and not in the mood to cook or go back out to eat.)
My grandchildren (ages 16 and 10) used the pool, the health club, and the guest computer, and all of us took advantage of the free shuttle to get back and forth to the metro station. The staff was extremely accommodating, the grounds were well-kept, and the atmosphere was very family friendly. The only difficulty we had was in getting the right number of towels for the first couple of days (I think it was a language issue), but that was sorted out, and we were always able to get what we needed by asking at the desk.
I am very impressed, and will stay there again if I have another opportunity to visit DC.