As the name implies, Robinson's Place is a tropical low-tech/no-tech paradise. I stayed here with my parents, brother, sister in law and my teenage niece and nephew for two weeks and would have stayed forever if we could have. I was worried that the teenagers (avid facebookers & twitterers) would hate it because there is no electricity, but they loved it.
It's plainly adverstised as simple on the website, ie: no power and communal, family style meals.
We were incredibly impressed with Eddie's cooking (the owner) and loved the way we were served and also the overall atmosphere of each evening meal.
We chose to eat there every night even though there were plenty of restaurants along the beach to go to.
If you're looking for a place to get away from it all this is it, the best room in the place, it's a treehouse, walls on three sides overlooking the indian ocean.
There is no electricity (eddy and Anna prefer it that way) so all there is to do is hammocks, beach, and food.
You will likely be the only one on the beach in any direction. Eddy cooks every night good zanzibar food (10,000 Tsh pp) family style for the guests only and there are other more expensive restaurants equally excellent on the beach in 5 min walking distance.
The location is right on the beach, it's walled off and safe (protected by their friendly beach dogs).
Every morning there is a fruit, jelly, toast, and amazing spiced tea for breakfast included in price.
They have mountain bikes to bike on the beach. if you're looking for a place on the east coast of zanzibar, this is the greatest value.
Only drawback to east coast zanzibar is the tide -- midday the tide goes out and the ocean is not swimmable, but when it comes back in its very warm (like a hot bath).
So only time to swim is early morning after sunrise before breakfast, and late afternoon.
We had no problem with mosquitoes at all, which we thought was surprising, although there are nets in the rooms.