Currency is Baht.
In 2004: 1 Euro = 48 Bts.
Roughly, 100Bts = 2 Euros.

There's not black market and you can change everywhere without problem, even Euros and traveller's checks in Euros. Many banks have ATM normally accessible from 6 to 22, even 24/24.

Attention, you'll pay a 6 Euros commission for each withdrawal or payment.

Life's cost

In "province", food and hosting are generally cheap, in Bangkok prices are very affordable having in tells the quality offer.
11 Euros per day if your budget is adjusted (hosting, food and transport), 13,5 - 27,5 Euros if your budget is bigger.