Tad late, but http://www.bashme.eu/
Choose your 1v1, 2v2, 3v3, 4v4, 5v5 etc. And just message a few times something like this
"D2 ON MID"
D2 is de_dust2 change according to map.
On means its your server, the people who PM you will expect the IP and Password.
Mid is the skill level you wish to play against.