They have English speaking customer service. No English GPS for small cars but Tamra has informed to download Naver via whatsapp days before arrival. Overall, very good experience.

just one staff can communicate with us by english and poor instruction to pick up location

The vehicle provided was not the model I had booked through easyrentcars.com, but it was an equivalent model, and seeing as I booked "economy", it was more than enough to get from A to B. Price was the same. Our only complaint is that the gas tank was almost empty when the car was picked up. I didn't realize until I was almost out of gas, and had to make a detour. The condition of the car was cosmetically poor (many scrapes and scratches), but that didn't matter to me for cruising the countryside. It ran well and had no mechanical problems. I was expected to document pre-existing damage to the vehicle using my own cell phone pictures, which was strange as a foreigner, but possibly normal in Korea. Huge bonus points to Tamra for being one of the only rental companies on Jeju island to rent to foreigners (non-koreans). At least one of their employees is impressively trilingual (English, Korean, Mandarin), which is a big deal for international travelers.

Old car, bad location to pick-up the car, bad customer service, ...