Gianni was a perfect host, super-fast communication and very helpful with the check in. His place is one of the cleanest and well thought out spaces we stayed at on our trip to Amsterdam. It's very evident that he goes through a lot of effort to make his guest's welcome and comfortable. Do be prepared to share the 1 toilet and 1 shower with other guest's which had it's minor drawbacks when everyone was there, usually in the morning and evening before bed seemed to be the high traffic times.
Transit is easily accessible but it is in the suburbs and not much to do walking in the immediate neighborhood. We did find some cool spots about 25 minutes walk.
If staying here, there is a fantastic outdoor BBQ "Rib shack" of sorts with some of the best ribs I have ever had, we fluked apon it on our way to a place called "Blauw Amsterdam" (don't go to Blauw.. it's an overpriced tourist ripoff spot imo).
Overall, Gianni's place is a fantastic value and after getting to know some of the area, I would certainly recommend it to others.