Hello Karen,
I was here in June 2 years ago. I took 400 euros for the week as we had breakfast and dinner. I had paid for my extra trips before I went so it was easier. The most I paid for was the gondola ride at 25 euros, gelato and souvenirs. I still came home with some money. I believe they have changed the hotel since and the nearest town had ATMs.
I usually attract the mossies but did not get bitten. I always take anti histamine creams and Piriton tablets. I had awful sandfly bites to my legs when I was in the Sinai-horrendous weeping down my legs for the next week- learnt from that :(
Hope this helps and have a great time.
Jan.