Euro is an official currency in Slovakia since 1st of January 2009. Any Euro coin is valid in any country of the Euro area.
The quickest, easiest and usually cheapest way to exchange money is to use an ATM.
Money can be changed at most bank branches throughout the city, or at currency exchange locations (often a booth, situated at the airport, train station and the central areas of the city). Banks are usually open between 9 a.m. and 5 p.m.