Most people decide to share a room and end up becoming really good friends with their roomie. However, if you would prefer your own space or if you know you're a snorer or a particularly light sleeper then that's totally fine and you can opt to have a private room when reserving your spot online :)
This article might help: Sharing a room - my advice to other Flashpackers
Also check out our awesome video about sharing a room - 'What's it like sharing a room on a solo adventure? | Roommates ep.1'!