Via Interlaken-Ost railway station (SBB/BLS) on the Bernese Oberland railway to Grindelwald. From Grindelwald station by bus in the direction of "Bodmi" to the «Gaggi Säge» stop, then it's a 2 minutes walk to the youth hostel. Alternatively you can walk from the station in about 15 minutes (signposted).
The youth hostel has a limited number of chargeable car parking spaces. During the winter months, snow chains may be mandatory. Access for coaches not permitted.