I can only assume you've not seen many houses in your life OP, or have some very boring friends and family if you think that very normal looking flat is 'sensory overload' and 'way too much colour and patterns without cohension,' (think you mean cohesion?). Pretty much all the walls are painted either white or cream, with neutral carpets ffs, you can't get more neutral than that. By the time of purchase all the owners fixtures/fittings would be gone, it would be the work of a long weekend to change the one wall of feature wallpaper per room, and repaint the kitchen cabinets to get you the boring and passe minimalist flat of your dreams.