In short words: Mimmo is a great guy, explained things in detail and helped us a lot to find good places. He speaks a very good and fluent German, too. The house is like shown on the pictures: fully equipped, fast internet (30 Mbit), 2 TVs (Italien TV only, bring your firetv/chromecast/tablet for streaming), gas stove, baking oven, huge fridge, big garden with BBQ/pizza oven, garden furniture and olive/lemon trees, the whirlpool is awesome, parking space for at least 2 cars. My only regrets: the beds/mattress need to be renewed!! (that is why 4 stars only) and for this time of the year thicker bed clothes are needed (but he provides an electronic heater), no dish washer.
Location is outside melfi, more or less on the fields, which I wanted to have and liked a lot. It's quiet despite the neighbors dogs and the cock yelling in the morning :) A good Italien restaurant is a few hundred meters up the road, a great agritourismo restaurant is 3 km up to road (called Tenuta Stoccatello). And for sightseeing just ask Google, Agrigento for example is 1,5 - 2 hours drive.
I recommend for couples and small families up to 2 children. Enjoy!