We - couple with two children - were in Venice during first week of May.
Giovanna was so kind and met us at the platform at Santa Lucia.
Location is great. Railway station is in 5 minutes walking distance.
Windows overlook the canal.
Apartment has everything for comfort stay for family with children - microwave oven, washer, dish washer, baby cot.
There're a lot of very good not expensive restaurants nearby. Supermarket Billa is in 5 minutes walk.
All sightseeing, including Piazza San Marco, are in 10-15 minutes.
The only disadvantage we noted is a very damp air in the flat, but it looks like Venice feature :)