I think they mean 5 rooms, not 5 bedrooms.....one master bedroom and 2 bedrooms for children with twin beds or bunk beds in each. I lived in a 1,300 sq ft house for 2 yrs with my husband and 2 sons. My suggestion would be to have an open floor plan for the kitchen, dining area and family room in one large room. Add a bar in the kitchen for casual dining. Be sure to include storage in family room for toys, games, etc. Add a built in desk in eiher the kitchen or family room areas . The master bedroom and bath should be large enough to accomodate a queen size bed and if possible a sitting area (maybe a bay window large enough for for a small loveseat or a couple of comfortable chairs). I would recommend a large walkin shower but no tub for the master bath. Instead have a nice size tub/ shower combo in the hall bath. Too make your house feel larger, use neutral camel, beige, gold or grey paint and carpet through out the kitchen, dining area, family, hallways and hallbath. If you want to add color, limit it to 3 bedrooms. Hanging all your window treatments at ceiling height will make your rooms feel larger and taller.

Given the very large living area, the USP of this apartment, there are a variety of screens available which can be used creatively, mobile or fixed, see through, translucent or opaque, full height or part, etc to divide the spaces and yet give a free flowing look of a large open space, the light and views from the large windows.

This is the size of the window. Such big artwork is practically not visually appealing and it would burn a hole in my pocket.

Hello Home, You can have 12" sill level and can go up till 7' high for the lintel. I am suggesting 7' only because you cannot or rather you should avoid to change the lintel of the old structure.