It's a very nice spot which probably saved me hours of worldgen. I especially like how the cave is not freakily distributed over every underground level, so that I can build large mausoleums, dining halls and stuff. Just two minor points of criticism: there seem to be largely gold and iron, I didn't find much other metal, but that's more of a general problem with the recent versions. And there's a bit of a lack of gobbo sieges, I had one pitiful attempt and one ambush so far - but a minotaur and a dragon at least came.
Overall a very nice spot, ++ for effort.