The apartment is impeccably beautiful and well cleaned. I would strongly suggest leaving some bottles of water, and maybe some coffee for guests arriving late. Also, an iron and some soap and toiletries would be appreciated.
Venice is beautiful and this is an excellent option if one wants to visit Venice. But at least for us, although we had been in the past, I found it more touristic than ever, with service almost everywhere below par, and the food at almost all restaurants disappointing.