30QR per hour seems to be the standard charge for private arrangements for house cleaning here in Doha plus you might have to pay a transportation charge too depending where she/he is coming from - hopefully you will find someone local in Al Khor!
Most cleaners here are either Philipino's, Sri Lankans or Indonesians. I have a Philli lady and she is very thorough. Speaking English reasonably well also helps!
Why would you want someone 6 hrs a day 3 times a wk? Unless you also want someone for child minding. My cleaning lady does top and bottom of our 3 bed villa in 3 hours and does a good job. She comes twice a week mostly to get rid of the dust that continually seeps in from all cracks n crevices! LOL
We do outsource ironing though and I do our washing! If you can find a good laundry service in Al Khor it should be quite cheap and satisfactory! Ours pick up and deliver too.
Good luck in your search and hope this helps!