Write to hola@diegofresno.com. It goes to a person, not to a form queue.
If you are reporting an error
Include the page and the specific figure, and if you have it, where you saw the correct one. That is enough to check it and, if you are right, fix it and note the correction on the page itself.
If you are an operator
If a price or a schedule of yours is listed wrong here, tell us and it gets corrected. We do not remove unflattering comparisons that are accurate, and we do not accept payment for placement or for a better write up.
Who publishes this
The Amsterdam Travel Guide is written and published by Diego Fresno, at diegofresno.com.