I was a solo traveler visiting Venice for a few days for the art biennial, and I had a wonderful stay at Federica's place. It's conveniently located, just a few streets away from the bustling Ca D'Oro area of town, and not too far of a walk away from the 'downtown' area of Rialto. For those of you who enjoy sunset drinks by the canal, there are some nice wine bars and restaurants just one street over. It's in a quieter, more residential and less touristy part of Venice, which I preferred.
Her place is only one floor up, which helps with the luggage. It is super clean, comfortable, and was outfitted with a really great bathroom that had every amenity that I needed. Federica was friendly and helpful, and breakfast items were also provided in a small pantry in the common area. There are two beds provided in the private room, and they are sturdy and comfortable.
There's no air conditioning, but the fan did the job when I was visiting. The air is cool at night in August, but mosquitoes are a hazard when the windows are open. The room had a mosquito repellent diffuser, but I'd advise others who are also prone to bites to double up on the repellent and buy some spray-on repellent before traveling to Venice in August.
Overall, I had a really great stay, and would definitely repeat again!