Ooh, Jungfrau. I've got that on the bucket-list for when I run out of PBs on flat marathons. 2017 possibly. I like running on hills but I'm a bit rubbish running downhill, so in a strange sort of way Jungfrau looks like my kind of race. Good luck, look forward to seeing your report.
Lovely 8 miles done this morning, 18 mile trail run tomorrow then Severn Bridge Half Marathon on Sunday. Then it's into taper for Jungfrau Marathon :)