Originally Posted by ROW2Aisle

2.5 hours connection time is adequate to head to the lounge, shower, eat and then take the next flight out. The DOH lounge for premium class passengers is one of the better ones in the OW alliance and they have plenty of showers. After a hot shower and hot meal I'm usually well rested for another long haul flight in QR's premium cabins.

If you really want to overnight then I'd recommend staying at the Oryx Rotana hotel where QR accommodates their premium passengers for missed connections. Then after a good nights rest and a hearty breakfast take a tour of the city, rest again and then head to the airport for your next trip. I've been accommodated twice on missed connections at this hotel and recommend it. QR *may* have a discounted rate at this hotel for paid stays. Link here.

There is also an Airport Oryx Hotel at DOH.