We can't say enough good things about Kosmas' place or about visiting Tinos. We did it as an afterthought; a pit stop to break up a long trip back from Santorini to Athens and we regret not spending more time there.
Kosmas' place was beautiful and his hospitality was perfect. It was a short 3 minute walk from the ferry, yet he still came down to pick us up, even though we told him we'd be fine walking. He showed us around the place and went out of his way to give us information (recommendations, maps, and directions) about Tinos. Check in and check out was as flexible as it gets and he let us hang around until our afternoon ferry.
The place has a great courtyard and the room he gave us was clean, very well decorated, and had an amazing balcony with a sea view. The wifi was great, the AC was cold, and they provided free filtered water and reusable bottles, which we loved.
The main harbor area of Tinos was a few short minute walk away and there were many great restaurants and cafes.
Tinos was a great town and we regret not being able to stay longer and explore the island further.
Can't recommend staying with Kosmas enough if you're headed this way!