From the airport , the easiest transportation route is offcourse by taxi. When you get out from the exit airport door there'll be many many kind of taxi brand's queu that you can choose from. I'd recommend using Blue Bird or if you want to try the more luxurious ones than you can go the Silver Bird queu or Tiara or White Horse. While convenient and all , using taxi can cost you lot more , around 200.000 rupiah by regular taxi in a regular traffic condition. If you're up for a bit of adventure and low cost transportation, you can take the DAMRI bus, its going from the airport to Blok M Terminal ( south jakarta) . From Blok M , you can go to Sudirman where the apartment is located by taxi which will take around 30 minutes or by using TransJakarta bus boarded also from that same terminal . You'll be needing to have a special debit card to pay for every bustrip you take so make sure to buy it at the bus ticket office. If you choose to go by Transjakarta the you'll get out at Karet stop, the World Trade Center building will be very close to you by now and you'll find the apartment just walking distance away. ( shorcut getting there is thru the WTC building, go from the front entry and get out at the back entry , voila , you're in front of the Tamansari Sudirman Apartment )