Pam Z.
Yelp
Love this local library. The facilities are clean and bright, and it's usually busy enough to be lively(some kids) but not so much that it's distracting(eg. Starbucks). Like other reviewers have pointed out, the computers are popular, so opt for a laptop if you've got one. I've always had good customer service here, and I'm usually just popping in for some quick read or a DVD right after work. They also have seminars, discussions, family programs, workshops, tax forms, etc downstairs.
DC library in general: I also like to go to the website and reserve DVDs in a series in order to place on hold. Just remember when you pick up your DVDs to get them "unlocked" so you can actually watch them. And you can only renew them once. Also, MLK central library has the best selection of everything, but it's definitely a more urban library, and this place just has a nice neighborhood feel.
**Correction on the hours: due to budget cuts, the library is CLOSED on Sundays. The rest of the hours remain the same. (MWFSat 9:30am-5:30pm, TTh 1-9pm) For those of us who work traditional 9-5s, I will see you Tuesday/Thursday night.