I use a driver called Hamsa tel 5336538. His cars are all new and clean and he is 100% reliable and knows his way around Doha with his eyes closed. I feel completely safe with him. He charges about 50QR from Hamad to Landmark, not that much more than Karwa and at least you can call him when you need him, if you call Karwa they can't offer you anything until 3am in 2025.