I'd highly recommend this apartment. The pictures on the listing are true to life and the apartment is very light, airy, modern and clean. Comfortable beds and good facilities. All 3 of us that stayed there were impressed.
Location wise it's perfect - a few minutes walk to the Old Town and about 5 mins to beaches. There's a great coffee shop / bar directly over the road called Koh Tao which is good for breakfast.
As it's not in the middle of the old town, the apartment is pretty quiet. But it is on a busy ish road, so I'd take ear plugs if you sleep with the windows open.