My girlfriend and I really enjoyed our stay at Panos Studios! The view from the balcony was so breathtaking, we'd rather leave the beach before sunset and go back to our room just to watch it from the balcony haha...
Kalymnos was the highlight of our stay in Greece. With the locals being extremly friendly, the whole island being rather quiet and not as touristic as other spots in Greece, we enjoyed our week on the island a lot. Panagiotis and his wife were very welcoming hosts. He offered to pick us up at the ferry port and took us to the studio by car. The appartment had everything we needed. Not only did we get fresh towels, they even cleaned our whole room for us.
The Wifi at our room was a bit slow at times, which may be a problem if you're not from the EU and can't use free roaming, but otherwise I'd say everything was perfect and considering the low price and how much you get for it I'd totally recommend the place! If I get to Kalymnos again in the future, I'd definitely try to rent the same appartment again :)