Internet Connection through MDU-HD COAX Modem port

My in-laws just moved into an apartment in a care home.  The internet they are provided by the facility is shared WIFI with all the other units. I believe the WIFI is supported by Comcast Business. The unit is at the furthest away and it is [Edited: "Language"].  The facility has MDU-HD units in the apartment. These units have both an HDMI Port (that their TVs are connected to for the shared Cable package), but the units also have a 'To Modem' coax port.   How do I get direct wired internet to their unit so I can put in their own private wifi/SSID.  I tried using a bridge, and this worked, but it also, is VERY slow.  Also, the people at the facility are no help at all.  Any advice or guidance on what to ask for or how this situation is normally addressed would be greatly appreciated.