A few of us around here have been there in the last couple of years. It's a pretty straightforward operation, so you'll probably get a little more up to date info than this (almost 2 years old). We had a good handler. Fuel took forever and a day to get, though. I think the airport closes at sunset, but after a phone call, we were able to get them to stay a little while longer and turn the lights on.
Stayed at the Ocotal resort. It was o.k. I think there are better options, though.
Do some checking. I read on the NBAA airmail a week or so ago that they were not allowing overnight parking for corporate aircraft. Not sure how long that was going to last.