I have been volunteering with help2kids for 10 weeks and it was a really amazing experience.
Because, there are several different projects I can only talk about the ones that I was assigned to which were : Bajeviro Primary School in the morning and English Corner in Kunduchi in the afternoon.
At the primary School the main task was teaching or assisting with teaching, but also marking tests and exercises. At the beginning, when you first arrive at the project, you usually have a talk with the Coordinator of the primary school project , where you can discuss in which grade you want to help out and also which subjects you're interested in helping explain the kids. Although, I really liked the project, there were moments that were rather chaotic i.e at times when there were a lot of volunteers and it wasn't clear anymore in which class one should go, or on some days, teachers didn't show up or left early ( after all it's Africa ;) ) and left us volunteers teaching alone at certain times, which is not for everybody. However, all of the teachers were amazingly kind and open people and if you needed help with the kids, they were willing to help. However, if you are not comfortable with standing in front of 60 kids and with teaching independently ( which I was not all the time) you might want to consider to volunteer at the Kunduchi day care centre instead of the Primary school, because there you work with much younger children and from what I've heard of from other volunteers, it's less teaching there.
In the English corner project in the afternoon, I taught English to local Fishermen, which was an amazing and rewarding experience. I have met some of the kindest people there who are also eager on sharing their culture with you. I therefore learnt a lot about Tanzania and also became good friends with some of the Fishermen and Women in my class.
The accomodation is a volunteer house, where all the volunteers and some of the staff i.e the volunteer coordinator live. It's a big house, in a nice area and there is also wifi, although it does not work all the time. Moreover, the food was amazing! I still miss Mama Martha's Chapatis and lentils.
I made many good friends in Tanzania, some of the kindest and most interesting people I have ever met, and would highly recommend to volunteer with help2kids. They currently also built a new childrens home, which is much bigger than the old one, so it seems like they are really putting in some effort to help the kids.