Again, this depends on a number of factors such as where you stay, what you do and how much you spend. However, in general, you can expect to spend around £700-£1000 per person for a week in Italy.
This includes accommodation, food, transport and activities. If you're staying in a major city like Rome or Florence, you can expect to spend closer to the £1000 mark.
Other regions of Italy such as Tuscany and the Amalfi Coast are often slightly cheaper, with a week's holiday costing around £700-£800 per person. Sardinia and Naples are also relatively inexpensive, with prices similar to those in Tuscany and the Amalfi Coast.