HMC housing is on of the most uncoperative dept in the corporation.Usually the first option they give u is all the rejected accomadation.SO you have to be meticulous in choosing one.
1)For grade 113 it suppose to be a villa but suject to availability.Now days there are ofering flats only to new specialist.
2)and 3)IF semifurnished they pay QR 10000. If unfurnished they pay 30000.But if u leave prior to 3 yrs you have to pay back certain amount ( not sure of) otherwise its exempted
4)Again how far it depends.If its Medical city then 5 mins.IF its wakra then 30-45 mins.
5)Yes housing allowance is 6000QR if ur spouse is not recieving the same.
Hope it was helpful.