We can highly recomend this apartment - everything is brand new and sparkling clean, comfortable beds, great shower and well equiped kitchen plus a comfortable living room. It is a rather dark like most Venice apartments but ther is a pretty square and benches just around the corner by the Arsenale. The location is great, steps from the grand canal and 10 mins walk from San Marco square. In the other direction are some lovely parks along the waterfront - great for relaxing after a days sightseeing.
The Castello area is more residential and light and airy which is a nice contrast to the center of Venice. Lots of good restaurants, wine bars and a supermarket nearby. The apartment is also just a few minutes from the Arsenale vaporetta stop so no need to drag suitcase over any bridges. Alesssandra and her husband were quick to respond to messages and spoke good English, check-in was very smooth and there is the option to leave your bags after check-out for €5.