Our stay at Sergio's place was perfect! My boyfriend and I stayed there for 5 nights in the end of march. The place is very neat and clean and has everything you need. The kitchen has all necessary supplies, the bathroom is spacious and clean, the bed is big and comfortable and there is a living room with a couch, dining table and TV (only Italian channels I think). The apt is located in the very center of the old town, the lake is only 200m away, there is a bakery with excellent bread right next door and two supermarkets are within walking distance.
We were able to drive right to the apt, where you're allowed to park for 15 mins with a special permission that Sergio gave to us. After we unloaded the car, Sergio showed us the parking lot where we could park for free with a card that we could keep for the rest of our stay and give back to him before we left.
Sergio was very kind and helpful, he always responded immediately and gave us good recommendations regarding restaurants and the area. We would definitely stay at Sergio's again if we come back to Riva :)