From Las Vegas McCarran airport:
Take Bus - 109 - Maryland - Direction: 109A Maryland Parkway - Northbound (via McCarran Airport)
Arrive to Ogden @ Maryland (W) (Stop ID: 5986) and from there you can walk to 1100 Fremont St by heading southeast on E Ogden Ave toward N 11th St and turn right at N 11th St and then turn left at Fremont St. Hostel will be on the left at 1100 Fremont St.