You can put the TV over the fireplace, not the best situation but the way the room lays out it is the only logical place to put it. If you could you should add one additional layer on your mantel that could extend it out another 4" to deflect the radiant coming from the fireplace. I would also mount it on a slimline mounting bracket and have the bottom of the TV no further than 4" above the mantle. Ideally you want the TV to be in as straight a line as possible with your eyes. You don't want to look up too high at the TV, it's like being at a sports bar. Also if you can snake up the power and the HDMI from the cable there is a box they make that has both in one so it makes for a very clean installation.

One of the biggest cons is that above the tv is way too high for most people's optimal/comfortable viewing. There are several different opinions about the best height at which to view a tv, but generally when sitting you should be staring at the center of the screen or at the very highest at the bottom of the tv. Unless you have an unusually low-profile fireplace, watch tv standing or are like 6' 6" tall, a tv mounted above the fireplace is going to make for some uncomfortable viewing.

I don't see the point, just like T.V. How long do you really spend in there anyway. Maybe once in a blue moon it would be nice but really? To be perfectly honest I don't understand the fascination with the huge bathrooms that need hours to clean, I would rather save that square footage and use it for something I would actually need like a bigger walk-in closet for instance. I live in MCM house we have 3 bathrooms all small and I love them. They are easy to clean look great and what we have are nice big rooms that actually function well.

I've always loved the idea of putting your tv in an old fireplace.