Hello Jayne, What a fun space! Here are a few of my thoughts: For the dining space, I would stick with a small, rectangular table. Because you have a doorway to the porch near the dining area and you want room to walk around easily, I would aim for something not larger than 60" long by 36" wide, but you can double check that in the space. As for the seating area, if you want to maximize seating, I might aim for a couch with one or two chairs along the wall with the window. I notice when I have guests, everyone chooses a chair. Not everyone wants to snuggle up next to someone they don't know very well on a sectional. It is also easier to rearrange if you decide to change up the layout. If you want to have even more options for seating, it might also be nice to do one or more ottomans that are cushioned and could be used for feet or as additional seating for guests. They could be grouped together or spread out when being used. If you ended up replacing your coffee table with a/an ottoman/s, you may want to also add end tables so there is a place to set drinks, remotes, or lamps, if desired. For an entertainment center, I would potentially choose something a bit more narrow to make sure it wasn't in the walkway, For instance, this entertainment center is 14" D so it is the same as the depth change in the wall so it could be flush. I can be clumsy and prefer to have things tucked away or I run into them! Then I would add a rug, some lamps, and maybe a great mirror over the fireplace to make it look bigger and brighter! Good luck with your decorating and please share after pictures when you're done!

Some more pics

Normally in a long narrow space, the secret to dealing with that is to put two seating areas, or one seating area and a small office, library, or music area. The first concern I have is traffic flow. How much are all these doors going to be used? We have to be sure people can easily get in and out of this space without bumping into furniture. Can you please give us some pictures, so we can get a better idea of where to put items? I have some ideas, but all of your existing ideas and furniture nixed them right away. What is going to be in the 21' x 10' room next to the stairs? Before buying furniture, measure twice, buy once!

@User Great question! There are two adults and 3 kids 5 and under. I am not naive enough to believe that the kids won't play in there so I am expecting we'll have a bookshelf or cabinet with toys in it. We are unsure about having a tv in there but definitely see ourselves hanging out and reading and relaxing. We have another area that will be more of a kids room/tv room so we would like to keep this room a little more formal and a little more oriented towards adults.