Nobody can do a thing from that pic. You need a FLAT floor plan with all dimensions of everything if you want to rearrange walls. Inches and feet unfortunately make it easier for help from the USA. Call us stupid................and too lazy to convert metric : )

You live alone, buy shoes and work clothes and lots of them. Got disposable income, perhaps? Your best bet is a call to an architect. Be armed with a wish list.

Rental unit or an owned unit? If you own, get an Architect as Jan suggested. Your unit size converts to 1450 sq feet which, in the USA, is woefully tiny to contain all the rooms shown.

In one house I converted a small bedroom into a dressing room by using free-standing Elfa components. That made it easy to return the room to a bedroom before I sold it. No damage to the walls, so it would work for a rental, too. The Elfa components have been reconfigured and distributed to meet different needs in my current home. If you own the apartment, you might want a more upscale, permanent solution. It depends on your budget and how long you plan to live there. Reducing the number of bedrooms would probably hurt the resale value. A real estate agent can help you understand the effect of any permanent changes on resale.

I'd put the office where the secondary seating area is, because I don't like to see an office in the public areas of a home. The dining room would be my second choice.

Since you don't need a dining room for dining, you could use it as a library, a music room, or a media room. It really depends on your interests.

I would convert one bedroom into a dressing rooms and who cares as long as it works for you whoever buys the house next can go back to using the bedroom as a bedroom I have no idea what that bedroom???? is off the kitchen but we really do need an actual floor plan to scale and honestly if we can’t convert meyric to imperial that is our problem I happen to live in Canada and we still often use imperial even though we should have completely converted long ago.

I think that bedroom off the kitchen is where a servant would sleep, there's a bathroom attached too -- is that so?