If you have been offered local travel coverage, then the amount of the allowances depend on your arrival and departure points, as follows:
For those arriving at, or departing from, Trieste airport there is a contribution of €12.50 each way. For those arriving at, or departing from, other airports there is a €30 contribution each way. So if you arrive at Trieste airport but depart from Venice airport the total contribution is €42.50. No other travel related allowances are foreseen.
If ICTP provides transportation between ICTP and the airport of arrival/departure, then no travel allowances apply.