I've used Petro for tech stop several times. Never stayed overnight though.
Petro is in a broad valley at sea level but surrounded by very high terrain. Nearest suitable alternate Magadan is several hundred miles away if i recall. Concrete runway has very wide seams...will rattle your teeth. Handling is what you would expect....good but not great. They use to mandate a visit to the weather office for a complete briefing even during tech stops...add 30 minutes. Not sure this is still the case though. As with many parts of the world a simple token gift and some $$ will grease the skids.
I would like to have stayed a day to explore as it looks like an interesting area.