I went to DC to attend a cientific meeting, which was taking place during the Cherry Blossoms festivals. So, everything in the city center was completely out of question (way too expensive). This Hilton in Bethesda seemed like a good choice and I didn't got disappointed.
PROS: Amazing room, very spacious, clean, comfortable beds with softness/roughness regulation. Good amenities, linens and towels. The hotel also got a spa with too heated pools, one being a jacuzzi. I really enjoyed being able to relax a little after a long day of work/sightseeing. Annex to the spa is a gym, with good and very new equipment. The hotel is very close to the Bethesda metro stop. There is a really good Argentian restaurant close to the hotel too and the next metro stop (going to DC) is Friendship Heights, which is a comercial center with just anything you might want to buy, from chain stores like Victoria Secrets and MAC to upscale revenues.
CONS: Well, in spite of being very close to the metro, it is still a little far from the hot spot in DC. The worst part is that the metro is not very cheap, so keep this in mind when booking!