I have been honored with such wonderful mature self-aware guests, that Eli took me off-guard. Though every effort was made to attend to his needs once they were brought to my attention, his expectations of what a host can control, provide, let alone foresee, are beyond reason.
Venice exists because of its lagoon - in late summer, there are inevitably mosquitoes. I use and offer every effective alternative insect repellent in lieu of chemical pesticides as a matter of principle. Those individuals who know themselves to be especially sensitive accordingly come prepared. When necessary, there are excellent products available at any pharmacy.
Similarly with the urban noise: The room is listed as facing a canal. Canals in Venice are our city streets - a waterway for boat traffic. Under normal conditions, some find the sounds of the water's movement agreeable, most appreciate that an urban canal in the city center will have boat traffic, most find that closing the double-glazed windows will do the trick. Those who know themselves to be light sleepers wear earplugs (or opt for another area of the city).
Eli indeed suffered (as most Venetians did) an exceptional weekend of tourist activity exacerbated by festivities around a much-loved movie star - resulting in heavy taxi traffic and late-night rowdy revelling beyond the control of even the local authorities, not only disturbing Eli's rest but that of most Venetians.
I offer my home as a respite, a place guests will enjoy for its comfort and calm. Eli's visit was an unfortunate and unpleasant experience for us both.
Should he choose to return to Venice, he might consider staying in areas of Cannaregio, Castello or the Giudecca ... far from canals and urban activity.