From Suvarnabhumi International Airport
Take the Airport Rail Link (ARL) to the last station, Phaya Thai. From there transfer to the Sky Train (BTS) and travel to Nana BTS Station ( only 5 stations = 10 minutes ). Alternatively you could travel on the ARL to Makkasan Station and transfer to the Subway (MRT). From there travel to Sukhumvit Station ( 1 station = 2 minutes ) and transfer to the BTS, then travel to Nana Station ( 1 station = 2 minutes ). In total either method would take 40 - 45 minutes and cost about 90 baht. Please note: Train lines run between 6AM and Midnight Daily.
From Don Muang Internation Airport
Take the A1/A2 Bus to Mo Chit BTS station. From there travel to Nana BTS Station ( 10 stations = 20 minutes ). This would take around 35 minutes and cost about 75 baht. Please note: Train lines run between 6AM and Midnight Daily. A1/A2 Bus runs between 8:30AM and 11:30PM Daily.
From Hua Lamphong Railway Station
Take the MRT to Sukhumvit Station ( 6 stations = 12 minutes ) and transfer to the BTS. Take the BTS to Nana ( 1 station = 2 minutes ). Alternatively you could walk 1KM from MRT Sukhumvit to Fun Wan Hostel Bangkok. Total time is about 15 minutes and costs around 45 baht.
Take a taxi or motorbike to Mo Chit BTS ( 10 minutes = 50 baht ). Alternatively you could take local bus number 3 or 28 to Mo Chit BTS ( 15 minutes = 12 baht ). From there travel to Nana BTS station ( 20 minutes = 42 baht ). Total time is about 30 minutes and costs 54 - 95 baht.
From Mo Chit (Northern) Bus Terminal
Take BTS to Nana Station ( 8 minutes = 28 baht ).
From Ekkamai (Eastern) Bus Terminal
From Sai Tai Mai (Southern) Bus Terminal
Take Local Bus number 40 or 511 ( 40 minutes = 14 baht ).
Take the Canal "khlong" Boat to Nana Chard Pier and walk to the Fun Wan Hostel Bangkok. ( 25 minutes = 12 baht ). Alternatively you could take bus number 2 or 511. ( 35 minutes = 14 baht ). Taxi should cost no more than 150 baht, cheapest would be 100 baht. Please note: Canal Boats operate between 6AM and 8PM. Bus number 2 is 24 hours.