Siem Reap is a popular town, since it houses the infamous Angkor Wat.
How to get there?
We booked a bus from our hostel out of convenience. It cost us $11 USD, including pick-up from the hostel. However, since we left on Lunar New Year, we didn't get the free pick-up. But, an employee from the hostel took us on a tuk tuk to the bus stop for free.
When you book, there will be different options for busing companies. We heard the Mekong Express is the most reputable company, but it costs a bit more ($15 USD). Since it was fully booked, we ended up going with Capitol Express.
The ride takes between 6-7 hours, with several stops along the way for food and washroom breaks. You'll get dropped off at the bus station in Siem Reap.