Whilst checking into Hotel Sir Albert in Amsterdam we mentioned it was the fourth time we'd stayed there. When we returned to the room later in the day there wa

Whilst checking into Hotel Sir Albert in Amsterdam we mentioned it was the fourth time we'd stayed there. When we returned to the room later in the day there was a charming card featuring a hand drawn Kiwi and a note, something like "Welcome home Mr and Mrs Forster". My wife has kept that card, even though she hates being called Mrs Forster (that's not her name). Total cost, maybe $0.5. Customer loyalty delta, very positive.