Look at Georgetownsuites.com
I've not stayed there, but hear they are real nice.
They advertise the first night "starting" at under $185, and the 2nd night is "the outdoor temperature at the time of check-in".
April is a fantastic time to visit DC.
Every highway median all over DC is just full of daffodils, etc. Azaeleas everywhere. The town just lights up in the Spring.
Driving over Key Bridge, and out George Washington Parkway, towards McLean is a lovely drive in April.
And, while you're in McLean, try Evans Farm Inn restaurant,
or you can go over to Langley, to visit the CIA headquarters......
okay, maybe not that last part.
Enjoy your visit!