See: D-grade strength: https://observatory.mozilla.org/analyze/www.waexperts.nl
User Enumeration The first two user ID's were tested to determine if user enumeration is possible.ID User Login
1 None diana
2 None iwan
It is recommended to rename the admin user account to reduce the chance of brute force attacks occurring. As this will reduce the chance of automated password attackers gaining access. However it is important to understand that if the author archives are enabled it is usually possible to enumerate all users within a WordPress installation.
150 hints for improvement (security included): https://webhint.io/scanner/582ad9ea-17ef-4e4d-bd98-14e06cbf28eb
Various security issues: https://webscan.upguard.com/#/https://www.waexperts.nl
polonus (volunteer website security analyst and website error-hunter)