I stayed at the Hermes in June 2015. My room was a twin in a seemingly new/refurbished building, ie it was very modern and fresh. The sheets and towels were replaced daily by the cleaner. The bed and pillows were comfortable. The shower was good, albeit a little small, with plenty of hot water available all day. There was a small fridge which I used for bottles of water.
There was an air conditioning unit in the room however this was subject to a daily fee. Wifi was also available in the room (with "excellent" connection), however this was also subject to a fee. I didn't try either so can't comment on their performance. There was a small issue with the wardrobe in that it smelled damp and very foosty, so I didn't use it and kept the doors closed. The pool area was spacious with plenty of padded sunbeds.
AIRPORT TRANSFERS - I arrived into the airport late at night and the only option was a taxi which cost 30 Euros. For the return, there is a bus service which costs TWO EUROS!! It was a modern coach and air conditioned.
COFFEE LOVER? - head to Bravo Cafe down at the beachfront for your morning espresso americano. It's freshly ground, Italian and the best in town.
BEER - draught MYTHOS is ubiquitous - it's very smooth, always served ice cold and available everywhere for 2 Euros or 2.5 Euros.
SEAFOOD - wonderful fish restaurant "LIMIONAS" is ten minute drive from Kefalos and located on the most stunning setting, overlooking the sea and a stunning beach.