What is a reasonable charge for a changeover?

where are you Shiela? we have a fabulous couple who do our changeovers....but our apartment is quite large...2 beds and 2 baths..balconies and large roof terrace....cleaning the apartment, which includes window cleaning...oven, hob, checking crockery etc.....changing sheets/ironing bedding...providing clean towels and bathmats, they leave a bottle of washing up liquid, soap and toilet rolls for each swapover...we pay around 100 euros...and have had superb feedback from our guests...our apt St Cyp, Languedoc...