My husband and I are planning a trip to Italy in August. After hours and hours of searching, reading this forum, and checking out reviews on TripAdvisor, we decided on Ca' del Dose for our Venice time.
http://www.cadeldose.com/index.htm
Check it out; and have a GREAT time.

It would take a miracle to get a room at Locanda Orseolo for June.

How many years in advance does one make a reservation at Locanda Orseolo now?

It is very difficult to get a reservation nowadays.

Well,I wouldn't say years,but more than one month!

We just stayed for 3 nights at the Ca'San Trovaso in the Dorsoduro sestiere almost smack-dab between the Zattere vaporetto stop and Ca'Rezzonico - a nice walk to the Accademia bridge, short stroll to Campo San Margherita, and nice hop to both of the San Trovaso trattoria, the Taberna & Giardina. We ponied-up for one of the canal view rooms (2 windows!) at 130 Euro/night. The collazione was basic (roll, croissant, juice, espresso coffee), but delivered to our room at a time we'd requested, nice! We had a few skeeters buzz us, but it was nice sleeping with the windows open - the morning sounds weren't a rude awakening as I'd heard on some of the busier canals. btw, you're as close to anything you'd like to see here in the Dorsoduro - in fact a lot closer to the Guggenheim - and you can reach anything by hopping the vaporetto from the Accademia stop.

On a side note - the woman working the daytime desk gave me one of the best Italian lessons I got on this trip: "succo d'aranjia" is more like s-s-s-soookoh dee-arahn-cha ;-) still not sure if I should stick with the "shock-a-trah" pronounciation for the wine! http://www.casantrovaso.com/

I think it's more than one month in advance for L. Orseolo's reservations now. Of course, it depends on the season. But I tried requesting about 6 mos. in advance and still they were booked.

Forget it. All these people who give you references to places like :a Calcina re wasting your time. Decent places in Venice are fully booked 4-6 monthes in advance.