Hi,I too just arrived,well 3 weeks ago;Yes it is safe,i haven't seen any scorpions yet as i haven't been in the desert,no tropical disease and cockroaches can be a problem if you live in a tower block in town as lots of construction going on everywhere you are in Doha.The main problem is the temperatures,especialy in the summer,july and august are unbearable.The driving here is hectic,a fast pace and bullying on the road is common,get practicing blowing your horn!!!I hope you settle down fine,i am still working at it!!!Good luck.