Apex domains cannot have CNAME records.
Question and response
Question
dig guesthouselindeboomamsterdam.com. NS
Answer
guesthouselindeboomamsterdam.com. 5 NS ns2.guesthouselindeboomamsterdam.com.
guesthouselindeboomamsterdam.com. 5 NS ns1.guesthouselindeboomamsterdam.com.
Authority
The response has no authority records.
Additional
ns1.guesthouselindeboomamsterdam.com. 5 A 144.217.166.41
ns2.guesthouselindeboomamsterdam.com. 5 A 51.161.91.55
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0