What do the native say to a guest from abroad when:

1. he is in the country and they are departing your country and for instance you are accompanying them to the airport in the car

OR

2. when he has left the country (e.g. in an e-mail)

a) I hope you have been pleased with your residence in Argentina.

b) I hope you have been pleased with your staying in Argentina.

c) I hope you have been pleased with your dwelling in Argentina.

I would be grateful if you could suggest me some other better alternatives.