Hello! I am a digital nomad working remotely and I’d like to work from Belgrade for 3 months. How can I get an apartment for a reasonable price for 3 months only? Where to look?

I will visit Belgrade for first time at the end of February. We are 2 men.

Need help with:
1. Where should i stay?
2. Where can i find cheap pubs?
3. Are there casinos in city?
4. I want to watch a football game. Do i need to do anything besides buy a ticket? Like fan card or something?
5. Is there ice hockey in the country? Will love to watch a game