Khao San Road is always busy, but after sunset it becomes really crazy, even in low season. It’s the place were most young western tourists party every night, there practically no difference between the weekend and other week days. Buildings on both sides of the walking street are all either hostels, clubs, pubs or souvenir shops. In front of them there is also a line of souvenir stalls on each side, so for example to enter our somewhat hidden hostel we had to pass through a small gap between two stalls. The cheapest place we found on Khao San was the Charoendee Boutique hostel: 550 baht for a double AC room or 400 baht for a double room with a fan. Its standard is, well, very south-east-Asian and not perfectly clean but it was the only one we found which required no deposit.
Khao San is not very wide and it’s always totally crowded, but still there is enough space for a third line of stalls in the middle, food stalls offering everything from roasted scorpions, pad thai, to freshly blended fruit shakes with papaya, dragon fruit, mango passion fruit and others. There are also stalls selling coconut ice-cream, sugar cane juice, pancakes and last bat not least, the famous mango sticky rice. It is almost impossible go to sleep hungry when you stay there.
There is a direct bus, S1, from the Bangkok Airport, which costs 60 baht per person. There is also a bus from the Railway station, 53 as far as I recall, but it stops opposite of the Bangkok City Library at Ratchadamnoen Klang Rd 39 (you have to cross Ratchadamnoen when you arrive from the Hua Lamphong Station (main station) to Khao San) which is a 5 minutes walk from Khao San. It also an interesting trip to get to the Hua Lamphong station by boat tram on the Chao Phraya river, for example starting near the Grand Palace.