We stayed at Roberto's place for two nights during September, and it was great!
The location is fantastic, right near the Guglie Bridge which is close to the bus terminal and train station (5-10 mins walk). It's also in the Cannaregio area which is great for restaurants and having a more local experience than one that's too touristy.
The apartment itself is large, clean, and has everything you need (including good wifi!). It was perfect for our stay. You can see the bridge and canal from the windows, which is great, but it does mean you can sometimes hear people below at the restaurant or walking along the bridge - it might not be for you if you're a light sleeper. But it is a convenient location, so that's why there is that little bit of extra noise.
Roberto was a fantastic host - great communication, very friendly and helpful - he let us keep our luggage at the house for a little longer than check out time, and he also helped us to work out the best way to get to the airport. Check in and check out were both very easy, and we found the whole experience to be fantastic.