Youth Hostel Venice

I go to Venice with a couple friends, just for one night, then others in Europe.
Anyone know of a cheap hostel (or B & B, etc.) that allows less than 18 years and does not require membership of any associationa

This is about one of cheapest hostels. My daughter planned to stay there, but when she was in Venice, it was flooded (what a surprise!). I got this information on their website (cut and pasted - except that I fixed spelling errors):

Ostello Della Gioventu Venice (OstelloVenezia.it), is part of the Hostelling International association in Italy.

Ostello Venezia is the beautifully situated in an ancient, refurbished grain store on Giudecca Island in the heart of Venice.

We have different types of dorms Female, Male dorms and private rooms, but all the beds at a price 21 Euros !!!!.

Please CAREFULLY read all our conditions before booking.

Palladian churches, the Doge's Palace, the Bridge of Sighs and the Peggy Guggenheim Collection are all easily accessible. The hostel has 254 beds and meals, TV room, lounges, tourist information, luggage store for members, lockers.

Please note, if you're not a member of Hostelling International there is an additional 3 € per person per night. Once you have stayed 6 nights at a HI Hostel you become a member of HI, and no extra charges apply for future stays.

Yes the one managed by IYHF (International Youth Hostel Federation), it is right next to the canal and it is really clean and comfortable.
If you are not a member, you pay a few euros extra.
You will find on the site IYHF