I'm not asking to be taken out to dinner for a big fancy schmancy meal or inundated with gifts. I understand that a week's free accommodation in Paris is a cheap holiday for some friends who might not get a holiday otherwise. But you can buy a reasonable bottle of wine for 5 euros here, or a small bunch of nice flowers for about the same - if someone has put you up for a week, fed you, provided beer, wine and gin, and you haven't as much as brought tea bags with you, it is not too much to contribute a bottle of wine to dinner one night, is it?