I don't mean to be pedantic about this, but there is a difference between providing "internet" and providing "Wifi".
"Internet", or access to the World Wide Web, is a paid service offered by an ISP (Internet Service Provider). It comes into one's location via some kind of cable. To access this internet, you plug your computer into the cable line (or modem). You pay a monthly fee.
"Wifi" can be thought of as a kind of radio system which accesses the internet service that is bought into your location over the airwaves, rather than by cable.
Wifi is provided through some kind of device attached to a computer - most modern computers and phones have this capability built in - through a router device attached to the internet input. One buys this equipment one time (or one can rent one from the ISP)
It’s reasonable to assume that most people might equate Wifi with Internet, since most devices offer this connectivity seamlessly.
One could offer internet service via an internet-connected computer (wired), for example, without offering Wifi at all. This is basically what internet cafes used to do (and possibly still do), although many have augmented their systems to allow Wifi (airwave) access.
The ISP could be delivering blindingly fast internet speeds to one's location, but the radio system (router) at the location distributing the signal could be very weak, thereby making the connection which goes to get this internet very slow.
The reason this is important is because the amenity specified under one’s listing says “Wifi” not “Internet”. This is also the reason, if one is a business traveler, and specifically wanting Wifi-enabled internet, not just internet, that one should clarify what kind of service is provided, and why, when asked to put “speed” under the “Wifi” amenity, it is the speed at which a device accesses the internet over the airwaves, not the internet speed provided by the ISP.
I say this as someone who has a blindingly fast internet service but a weak router, which I have just replaced at some cost, in order to get a system in place which would be strong enough to broadcast the signal to every area of my house.
Lecture completed, thank you 😉