Marta's is not worth the price - the woman herself offered us 350.000 Rp. per person in low season. No electricity, dirty, mosquito nets with holes, etc. Sorry but this is absolutely not worth the money. After bargaining, she was ready to lower the price on 300.000 per person but still...thanks a lot.
Onong is very nice, we spend 3 nights there as we got at least great discount but still bit expensive.
I was very dissapointed by accommodation options on Siladen. I think they need to lower the prices or rely on organized tourist groups from western europe or US, if this is enough for them.
Tanta Moon was renovated in late 2009 and is not as inexpensive as LP guide says anymore