When arriving at Keleti railway terminal, take the 7A, 7E, 107E, 173, 178 or 5 bus towards Blaha Lujza square. Go one or two stops (depending on the bus) until Blaha Lujza square. You now have the option of walking to the hostel along the tram line on Erzsébet körút by making a right after the bus stop, and going until Erzsébet körút 50, or you can take the 4 or 6 tram going towards Széll Kálmán square to the Király utca tram stop, and walk back a block to Erzsébet körút 50!.