Looking for info on Washington DC

[Nicks Fan]

I am going to the 9:30 Club to see Blondie live for the first time in concert. I am trying to get a decent hotel in D.C that is not too expensive but also not a roach motel located in a bad area. I am not having much luck. Does anyone have any suggestions. I am also looking for general info about the city and things worth seeing and how best to get around. I am flying in on the Sunday and leaving Tuesday evening. The concert is Monday evening.