Get your ISIC card as soon as possible. After that, get the White Train Card, which will save you a lot of effort when planning trips and help you save a significant amount of money.

Arrange your accommodation time before coming, coming without having arranged it will cost you time and money since you will need to sleep in a hostel meanwhile.

Check your room facilities and go to shop with a written list agreed by all the roommates, in that case you will avoid second visits and buy things you won't really use. 

Do not cheat on public transportation. There are many ticket inspectors in plain clothes, and getting caught can result in a hefty fine that can seriously hurt your budget. The process is also not a pleasant experience.

Know Slovak people: They can help you with issues you may have and also recommend you places to go.

Have a free tax withdrawal bank account, you will need to withdraw cash many times during your stay, and you should avoid those nasty commissions that can take up to 8% of your money. I recommend having Revolut.

Have a free tax withdrawal bank account, you will need to withdraw cash many times during your stay, and you should avoid those nasty commissions that can take up to 8% of your money. I recommend having Revolut.