Goros
Inspired by Tokyo dive bars, Goros is a trendy Surry Hills hangout that also doubles as one of the best free karaoke bars in Sydney. They've got three quirky private rooms designed by local artists, with a different theme in each, and you can book an hour and 45 minutes in any of them with no charge. You won't have to miss a moment of fun to go to the bar either, as they've got an ordering app in all their rooms that lets you get drinks delivered.
They host groups of anywhere between four and 18 people at a time, and you can also take advantage of their Japanese menu - featuring teriyaki chicken, vegetable gyozas and bento boxes. And if you're in need of more entertainment? They've got pool tables and retro arcade games here as well.