Ema's little apartment is really sweet! The situation is just as good as the other reviews suggest: really close to the Arsenale vaporetto & Alilaguna stop, and only a short walk from the shops, bars, and cafés along Via Garibaldi in one direction, and north of Campo Bandiera e Moro in the other. The kitchen is well equipped, there's plenty of hot water for the shower, and the bed (futon mattress, but much better than those super-thin Ikea ones) will please all except those who need super-soft mattresses - and there's a good light for reading in bed!
Ema is a lovely host - speedy responses to my various messages. She met me at the Arsenale stop, and showed me how everything in the apartment works. She's put maps, and lots of useful local info, on one of the walls in the kitchen: this place would be great for the first-time visitor, as well as for more seasoned Venice-lovers.