The Hotel Alexis is not really a hotel, it’s more like a bordello. You’ve got a good club downstairs, The Play, with house/progressive music and sexy dancers, and a very select lounge/spa on the seventh floor, the Bathhouse, with girls from countries as far as Uzbekistan, Myanmar or Russia coming to entertain the patrons. Entrance fee for the Bathhouse lounge is Rp. 120,000, and no drinks included. Also a karaoke on the 5th floor (I forgot the name), very nice, with flat screen TV and audio equipment suitable for outdoor concerts. Goddam expensive though, about Rp 3.5 million for 4 people.
In the club the Play, they have a sort of live show with naked girls pretending to have sex, but you can only see the shadow... quite interesting... People call it the Aquarium . Alexis has become one of the most famous party place in Jakarta over the past 2-3 years, along with Stadium, Bats, Blowfish and Red Square. Be sure to check the 7th floor...

They have the mythical "Alexis Open Air Parties" that I've never been to, and I don't know if it is a regular event or not.
Contact details:
Alexis Hotel, Play bar, Bathouse Spa, XiS Karaoke
Ancol, Jl. R. E. Martadinata No. 1
Jakarta Utara 14430
Phone: +62 21 6983 3333
Fax: +62 21 6983 1111

Excellent website here: Jakarta Hotel Alexis Website