Great question — answering as the UphillTech team:
You can get anonymous OV-chip cards as well as ones that are bound to a person, with a name and a picture on it. Both kinds can only be used for one person at the time , the anonymous ones can be used by different people at different times. For the train you need €20 on your card, for city transport in Amsterdam €4 unless you need to take the train there as well. At the start of your last train travel you need to have at least €20 on your OV chip card, whether personalized or anonymous. At the start of the last bus journey you need to have €4 on your card. Mostly your travel will cost less which will leave you with left credit on your card. You can get it paid back, as far as I know main...
Full answer by Willeke: https://travel.stackexchange.com/a/77460 (CC BY-SA 3.0).
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