The flat has very good price and it's in 2 mins of waterbus stop from which you can reach M.P. Airport in 30 minutes for 15 euro. You could travel to another islands/parts of Venice as well. But it was far from San Marco.
The main minus - it was cold in the room at the first days of May(maybe it depends on Venice climate, btw Leonardo has a heater)
It is sad that we didn't meet Leonardo but he is great, kind, pleasant and communicative person by whatsapp.)) He gave us really good instruction of how we can get to the flat/living rules/etc.
Thank you one more time!