A hosted assessment still needs an independent brief
Arrangements for a review stay should be clear before the visit. The professional fee pays for the assessment and written findings. Accommodation, dining and selected experiences are practical requirements whose treatment should also be agreed.
Whether those costs are hosted or reimbursed does not remove the need for an independent brief. The reviewer should be able to record inconvenient findings, explain the evidence and distinguish observation from interpretation.
I would also agree who knows about the visit. An anonymous assessment and an announced visit create different conditions, and the report should reflect the arrangements under which the experience was observed.
Confidentiality is a separate part of that agreement. A commissioned assessment is delivered to the agreed client recipients. Its purpose is to support decisions within the business, rather than produce a favourable public endorsement.
These boundaries protect the usefulness of the work. Clear costs, a defined scope and an honest description of the assessment conditions help everyone understand what the review can establish and how its findings should be used.