I visited Peace Matunda as a volunteer from the UK for 12 months between 2010 - 2011. It's an incredible organisation that was founded by the local community and is managed by a local team.
Since 2007 the organisation has transitioned from an informal community focused welfare organisation to a registered English-medium primary school (this is a HUGE achievement!)
It also houses approximately 25 children who would otherwise struggle to achieve full tertiary education to to lack of finances, housing, support.
The project is a working school and children's home so please go with this in mind. You will need to have a professional attitude to all tasks and consider that your role could range from being a teaching assistant, children's home assistant to running extra-curricular classes (amongst other tasks). Whilst it's not there to tailor its every function to your every whim (as some organisations do at the expense of their beneficiaries), it will provide you with a very friendly, insightful and educational experience into life within an education development organisation.
The organisation has a large international support following and is situated in one of the most beautiful regions of Tanzania. It sits at 6km up into the stunning rainforest of Mount Meru, about a 30 minute drive into the city of Arusha.
You and your fellow volunteers will be the only "wazungu" (foreingers) in the immediate area so you'll have a very unique experience "off the tourist trail".
I would definitely recommend visiting Peace Matunda - you'd be missing out on so many untold travelling stories if you don't!