It all depends what's your definition of "good", your standard of living, your work experience etc. etc. It might be OK for an Indian national, but others will have to comment on that aspect.

Read the link, which was written for a Canadian:
http://www.qatarliving.com/discussion/is-35-000-qar-month-worth-the-move...

and adapt the expense part to a single person. Good luck.