Great stay at Top of the Lake
Stayed here for 5 nights in tents. Plenty of room. Despite a lot of rain before we arrived, the ground wasn't particularly wet, and didn't pose any issues. The facilities are simple, but work perfectly.
We didn't use the flattened area because there were puddles around the edges and we were worried it would get messy underfoot, especially with more rain forecast. It had been raining fairly solidly we gather that morning. The puddles drained in less than 24 hours despite the additional rain, so that would have been the perfect spot to have put our kitchen tent as it happened. Will know that for next time!
The only downside was that it is right next to the highway, and the road noise during the day was quite constant - high speed passing traffic, not car revving noises or the like that you can get in towns. There was hardly any traffic overnight so it really wasn't that much of an issue. Might be a problem if you're a particularly light sleeper, but it didn't bother us.