The space is as expected. There is everything you would need including detergent for the washer and some soap for the shower.
The only thing to note is that you will be staying in the Jewish Ghetto which is fairly far from St. Mark's square. You can walk, but it is over several canals and many turns. Google maps works ok, but it can jump streets if you dont pay attention.
If you are 29 or younger, I reccomend the roll venice card. It let's you travel on all the waterbus lines except the airport. At 22 euro for 3 days versus 6.5 per trip it pays for itself quite quickly. It let's you get over to Murano for the stained glass or Lido for the beach.
Happy travels!