Thalassa Hotel (SHA Extra Plus) in Koh Tao Island

Stayed here for two months and it was wonderful.
Fantastic location 3 minute walk to Sairee Beach, and multiple delicious restaurants. Multiple bars adjacent and across the street. There is some noise from music and bikes if you're sleeping facing the busier street, but if you're used to sleeping with some noise it's not bad, and the window shades hide any light.
The staff were all super friendly, happy to talk, and helpful with suggestions about things to do and general navigation around the island. Also they were very helpful with any problems with the room (which were few, but promptly dealt with).
The room was clean (and cleaned daily--which was great for someone who was tracking sand in from the beach!), had AC(which would cool quickly once the keycard was put in place), comfortable bed, and a had a wonderful pressurized hot shower.
All and all, great simple accommodation that convinced me to stay there my entire trip to the island.

Simple and modern hotel in Koh Tao. The food is very good. There are life music and small event every week.

We really enjoyed our stay here.
Free shuttle from the pier which we did not expect.
Rooms were basic but nice and clean. AC worked great.
The staff were always very helpful and friendly. Although they did not always understand our accent they tried their best to help.
Breakfast at the attached restaurant was great. 3 options of healthy, English or continental, which all consisted of a pancake and other things like a selection of fruit or bread.
We found the location very good as well. Close to a lot of cheap places to eat that were a little inland and also very close to the beach and bars.

For 900 baht a night it was a steal. Very comfortable beds. Great air conditioning. Quite clean and very quiet rooms considering it's on the main road