If you are in Yerevan and need a trnasfer to Tbilisi , it's a perfect option to get a private transportation. Depending on your prefferance the road can pass by Lake Sevan-Dilijan-Ijevan-Bagratashen-Tbilisi or Stepanavan-Odzun-Bagratashen-Tbilsisi.
You will be taken from your choosen location in Yerevn and transfered to Tbilisi your picked up location
The car offered for 6-18 person is Mersedes Sprinter .
In a case of request lunch can be arranged on the way In the village Haghpat.
In a case if you need a trnasfer to Tbilisi Airport be aware that the direct road will take 5-6 hours