Thanks Luciana for taking the poll! If you are looking for floor vases, you might like something here: http://www.earthandfirelab.com/#!floor-vases-2/c1ro9 They all come in three different sizes and various colors, handmade and hand painted. If you have any questions, please send me a message and I would be happy to answer

What about if you put a box dormer in the original house? This would create more room there and you could then reconfigure that part of the upstairs to have three bedrooms and bathroom thereby leaving more room in the extension for your master suite.

'Pocket Doors' are a good space saver. Very popular in Australasia. Quote straightforward to install and many kits are available. Here's one we have installed.

I think trying to turn it into a room, when it is in fact a large landing, is where you're possibly going wrong. You can't put things in the middle of it as it's a thoroughfare. ( with the exception of maybe a table with a vase or such like ), Instead you could choose to celebrate the space you have, maybe a bookcase or two? A small corner sofa bottom left? Linen cupboards? Depends on your style of furnishing.Large landings are usually used predominantly for statement pieces of furniture and are not intended to be rooms for use. They just celebrate space. Obviously I don't know the layout of the bedrooms, which one is the master etc. However, given the space available on the left, You could also do a couple of things. Donate the space just bottom left to one of the bedrooms as an en-suite?Or if the bedroom off to the left could use the space, then you could claw back half the landing and give it all to that room by moving the entrance. Thus that room would have built in storage ie wardrobes, drawers in the smaller space at the top and an en-suite in within the room bottom left. This would leave you with what you might deem a better shaped landing.