Their current lay out block traffic flow. I would much rather go with a love seat and a few comfy chairs. How many in your family. That is how many seats you need. The rest is over kill and does anyone actually FILL a huge sectional or do three people use it? I am just not a fan. As for the TV placement, most want a visual of both the fireplace and the TV so your plan seems to be a decent option. The built in would be worth looking at...It is ironic how often the MOSTLY unused fireplaces everyone desires really messes with furniture arranging. Your new floors are to die for. This gray fad confuses me. Gray is cold,like stainless. Your kitchen and flooring are so warm and rich looking. Half your new space is painted warm the other cool... Which colors will you embrace?

You can't put the TV on the wall to the right because all you'll see is reflection of the light coming in through the windows behind the couch. Yes, light blocking drapwes would solve that, but all the time as you watch TV? No. Put it to the left of the fireplace, wall-mounted on a swing arm so that it can be angled slightly, if needed (if you put it to the right of the FP, you'll still have the reflection problem)..

Not a Pro. Your rushing, if you post a pic of accurate dimensions of the room you will get so many different layouts from the posters on Houzz and one of them will work for you and your needs. I would not make a separate area for the baby and toys in your room, because they out grow the area fast, but I would make sure you have decorative storage to house the little toys, etc. Something that can later be used to store board games, blankets, etc. Think long term. Don't rush, just to fill the room.

Room dimensions are 15ft by 12ft