Google maps link to the hostel : https://goo.gl/maps/hGaNKJRpMcbMWSdw9/
Bus: Buses from Delhi start at Majnu Ka Tila and drop at Bir Bus stand. You can book bus tickets on Redbus/Paytm (our recommendation would be Bedi Travels, Luxmi Travels and Snow Region). You can also call Ashok(a local bus vendor) on 98058 80057 and he would help you out with bus bookings.
Airports: You can take a flight to Dharamsala (Minor Airport), Chandigarh or Delhi.
Train Stations: Pathankot, Una & Amb are the nearest train station. Bus/Taxis are easily available from there to reach Bir.
For Taxi, you can contact Mr. Surender at 8894246087, or Mr. Manohar at 9418008842. They are local Taxi vendors of Bir.