ferienwohnung-koetzel.de has been around since 2013 and presents itself as an 18+ access site. The domain has a valid Impressum, which is a good start, and its long web archive history suggests it's not a fly-by-night operation. But when you're dealing with an adult site, you want to know exactly who's behind it and how to reach them if something goes wrong. That's where this site falls short: there's no obvious contact information on the homepage, and the site still accepts outdated TLS connections that modern browsers consider unsafe. The lack of a Trustpilot presence isn't unusual for the adult industry, but missing contact details is a real concern. If you do decide to use the site, stick to basic browsing and avoid handing over any personal or payment data until you see clearer signals of operator accessibility.