I had the pleasure to stay a whole month at Casa Leo and it was a wonderful experience. Scicli is a beautiful, relaxed town and perfectly located for exploring the region. Leonardos place is ideal for longer stays. It's a charming old house, beautifully renovated and equipped with everything you need. Mind though that you need to get an Italian SIM card if you need more data than your own mobile phone tariff provides.
The first time you enter the house the ground floor looks darker than the pictures suggest. But as soon as you open the shutters and start to discover all the clever lighting ideas that Leonardo has installed you feel at home right away.
Yes, you have to carry your baggage up an alley to get to place. This might be cumbersome if you stay one or two nights only. For me it actually is a big advantage of the house, because it means it's free of traffic noise and wonderfully quiet day and night, while still only a couple of minutes walk away from the town's center.
Leonardo was friendly and always available for every question that might arise.
Casa Leo was my best Airbnb experience so far. I recommend it wholeheartedly and hope to return some day.