We had a great stay with Achillina. The location is perfect - right along one of the canals that the gondolas travel down frequently. It's very cool to be able to see, but the windows must be great at blocking sound because the room was so quiet. Also with the shutters closed, it stays very dark, so you'll sleep very well - the bed is comfy too.
The room was very spacious, which was surprising for such a popular city in Italy. The location is very close to Doge's palace and one of the water boat stations that is on all of the major lines.
Achillina was very friendly and accommodating. We had a 2:30 tour, and she allowed us to check in early, which we were very appreciative of. She provided great instructions for check-in and was very friendly. She was out of town when we arrived, but had her friend Paola meet us at the water bus stop, who was equally as kind and helpful. We would absolutely recommend this apartment for your stay in Venice.