Hi @LocalDusseldorf if you want you are free to promote your professional activity using Google Adwords (I did it in the past), but the message you are trying to use is not allowed, because “reviews” is part of the Local Guides program, and you we are not allowed to offer this kind of service (free or paid) to customers.
You can offer support for managing reviews, photos and Google MyBusiness entry, but you cannot offer “free reviews”.