Salary sounds decent.
There is a relatively small Jewish community in Qatar; it's not well organized, but there are people to hook up with once you arrive, so you will find friends to celebrate Channukah and Pesach with -- don't worry!
Qatar is a very easy-going place to live in, so no worries there. As a single woman you'll get more than your share of male attention (much of it unwanted), but as long as you can deal with that, no problem.