amsterdam bike rentals?

Anyone have any recommendations for bike rentals during our stay in Amsterdam? I assume it's best to go with an outfit that has unmarked bikes (although these may be hard to identify in the middle of a bike parking lot)... pay for a lock, pay for insurance, as well? I see how it can add up. But bikes = freedom. Our host recommended macbike.nl, but these seem to have bright red markers identifying them as rented. We arrive on a Saturday, leave early on Friday morning, so I estimate we will only rent 5 days (Sun-Thur)...

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