Timeless classic! You can never have enough marble, provided you keep the rest of the bathroom fittings minimalist and clear, i.e. more sleek stainless steal than fussy gold ornamental ones. The full on floor to ceiling marble bathrooms I have seen have kept all other items very simple so to enhance the marble as it's pretty imposing on it's own.

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This looks to be a semi detached property - is that correct? If so then I wouldn't recommend changing anything dramatically from the neighbours as it'll visually unbalance your half and generally detract from the overall appearance. Just add some planters either side of the front door to soften it off.

what is the level of insulation provided by glazings and new walls? especially glazing, to avoid dispersions... ideally radiators should be close to the cold points (glazing, again) to balance the environment and shield the incoming cold. The corner with the table seems the best option, if I translate this plan into a finished space. Other factors: Curtains can help. Solar gain (exposure) can help. A dark paving outside can help (absorbs sunlight and releases heats slowly). I often say it's better to consult an architect in advance, dear, because of matters like this that get pointed out during the design... But do not desperate, just make sure the insulation is good and the glazings are good too!