Do not get a taxi from the desks in front of you after you passed through the last customs check, they will be asking 35USD or more pre-paid Go outside, ignore the taxi touts and get a Silver Bird which will cost you about 10USD on the meter plus a small charge for the toll road. Atlet Century Park is the nearest hotel to Senayan, check price on net (I use asiarooms) but it will be more than 30USD.
I should add that if you are trying to impress up market girls/models they won't be impressed with the Atlet or any other similar or cheaper hotel; you will need to be paying circa 100USD minimum. Jakarta girls are very well tuned in to the price of everything.
Also see my report on what you can find before you leave the airport!