Yes
Mist only has a couple of Med & Large plots left, Lavender Beds & The Goblet have more available including some smalls.
Yes, one of the 2 most active EU servers.
Good, however there are too many gil buyers which messes with prices sometimes. 4 star crafted items sell well but the market board can be ruthless. There's a strong market for selling primals and coil runs, if you can get in on that.