We have TVs in every room with cable & Netfix through Roku. We are in the US.
Alot depends on what type of guest you are wanting to attract. If you are going to promote a quiet, romantic getaway, you may not need TV.
If you are located in a very touristy area where you will mainly serve as a place of rest, TV may not be a high priority amenity.
But if you will have the guest that will be both in and out during the day, or a more of a business guest set up, TV is usually an important amenity to have.
You could start off with TV in some of your rooms and none in others. Watching the booking trend for a while may lead you to know if you will need to expand it or not.
I would defiantly say WiFi is very important in today's world. Get the best & fastest you can get as guests will want to connect with all their devices..