Seems like the place you indicated is the most logical...or you could mount it on a swivel arm under the stairs and put seating in front of your counter...that would allow for an additional swivel chair where the oval table is on the first plan.

Very cute place...

I would suggest getting rid of the white console you currently have the tv on and move the other console over and put the tv on it. It works best if you can watch the tv looking straight on at it instead of an angle. Find a taller narrower cabinet for just inside the door at the entry. Great small space. Less is more when working with limited space. Look for Double duty.

Cheryl, I believe that the OP's place isn't finished yet and his is the last photo...

Maybe the first two are models?

That’s right the first two is just a model

Have you considered a TV on a pole like below?

Or an articulating arm mount from the bottom of the stairs (check for safety).

Or have a free standing cabinet with a TV that rises from the interior like below. TV is inside the cabinet when not used and when you want it, it rises out of the cabinet.