Lots of ideas....couldn't resist adding my two cents. i copied your photos and did a little cut and paste- it's messy, but hopefully gets the main idea across. i'd put your sofa in front of the large book case, chair by the fireplace, tv on the stand on the wall opposite the fireplace - so you can either look at the fire or the tv. Someone suggested using frames of one color for your photos - an inexpensive way to do that would be to spray paint them all a dark color-black goes with everything. Since your shelves are a medium tone wood, display things that are dark or light so that they contrast against the wood. Limiting your display items pallette to a few values usually helps to unify things. (I think that's why so many people want to paint the shelves or put inserts in the back to help your nice things read more clearly...some get lost). If you want to "splurge" -you may consider having a carpenter make a few solid tall cabinet doors to provide a visual break in the shelving. I'm showing 3 doors - 1 on the right side of the fireplace and 2 on the left to leave two open vertical shelves for display on each side - with things arranged to frame the fireplace as the focal point. To add some height to your big vases, consider stacking some books beneath them. Enjoy experimenting untill you get something you're happy with - good luck!

In a kitchen, with built-in seat backs and a table to eat at, it is called a banquette. Otherwise just a window seat.

You can leave the handrail the same distance from the wall as it is now. Leave it connected to the newel post at the top; remove the newel post at the bottom, and add what's called a 'return' to anchor the bottom end to the wall. Then add a couple of brackets going up the stairs. The challenge is that the return should match the profile of the handrail, in order to blend, but check at the home center or a lumber yard/mill to see if you can match it (take measurements/drawings/close-up photos, etc.). As for painting the stairs--be careful with "fun" graphics. The treads and risers need to be clearly defined and regular. For example, a plaid or check that doesn't match the tread and riser exactly at each step is a trip hazard and may not meet building codes. People need to be able to see the treads clearly even without paying attention to them. Walking is an unconscious activity and we need to make it as easy as possible. Confusing patterns are a menace. In NYC, they put new edges on treads on one stairway at one train station that were designed to make them less slippery. However, they also made it more difficult to discern the edge of the tread. In 6 weeks, more than 1,400 people fell down those stairs. Then they redid them. Over 90% of injuries on stairs happen during descent. I highly recommend Bill Bryson's great book 'At Home--A Short History of Private Life'. The NYC anecdote above came from Chapter 14--'The Stairs'. Fascinating and amusing book. My house is 100 years old, so I feel your pain dealing with the changes and additions that happened over time.

A15) @Dara Cooke: If you can't afford a quartz or granite worktop from day one then I would recommend using a laminate worktop as a temporary solution. If you don't put tiles up as a backsplash then replacing the worktops can be relatively easy in a couple of years.