I was in Nepal for 5 weeks where i participated in the 2 weeks language and culture program, 2 weeks of trek and 1 week to volunteer in the monastery in the Himalayan region. The experience has been a great one. The language and culture are well organized and you are more immersed and well informed of the culture. But I liked being in the Himalayan the most, where there's no cars, motorbikes and no honking, only donkeys, yaks, horses, Sherpa and trekkers on the road. The trek was organized with a guide and porter for you and the teaching at the monastery was a fun and rewarding one. The monks ages from 8 - 16 and they are very engaged, eager to learn and interested to know where you are from and your culture.
I came also with a hope of finding spiritual revival, of finding peace and was able to find it here. Each individual will have his/ her own experience, but i think being flexible and open minded to the culture and expectation will be a plus to help you adjust if you are new to the culture. It has been a great experience and I hope to come back one day.