Safe and rewarding

Go for it! I spent a month in an orphanage and one month in a monastery, both times teaching english. I was provided with food and although the sanitary conditions were not perfect, i don't think it could have been better, considering the 8 hours of power-outage that the country experiences every day...
And the fact that you are with a local NGO (Love Volunteers links you to them) reduces the cost very significantly. That's a plus, if you're a broke student like me!