You can get away with quite a lot in terms of colour selection and pattern, if you keep to the black sofas and white/glass high gloss look, you might be spoilt for choice. If your furnishings are in the beige/stone/brown scheme, it does narrow your colour choices somewhat. The main thing to ask though is what will your floor and skirting boards be like? That has a greater impact! Do you have an image you could attach of the kind of look you want the room to have?

Which period are you trying to emulate? The damask isn't to my personal taste although that's neither here nor there but I do think the scale may be a bit large and heavy for the room. Have you considered trellis/quatrefoil/geometric/chinoiserie etc style papers? They are period papers but popular Atm. Or just consider something with texture,mie grasscloth effect. You could keep the walls fairly light or neutral in colour and add colour for accessories, art etc. Or if you're going for a velvet Chesterfield consider teal, burnt orange, green, blue etc. You could also add more classical/period accessories ie urn or acorn style lamps, horses head etc (I have one I love from oka which was only £26!). I would choose the paint after the paper and the paper after the sofa!

You have an amazing room and your idea of a double sided fireplace is awesome. I agree with colourhappy in not having a carpet but a wood floor. From the description of your taste you sound as if you like rustic and homely. A wood floor would look amazing and could be dressed with animal skin rugs or arty rugs or sheepskin - you could change the look with the seasons. You also seem to have some fab retro/mid century furniture on the far side of the room. Maybe you could change your sofa to something either retro or modern (think square - see dwell.co.uk for examples) and keep this style going. Clean modern lines would really give this room a fab look. Also, as the room is both a living room and study, could you move the dining room into this room and the study to the dining room? I think the room's identity as a living space would be more consolidated this way, if it's possible.

Hi there! A grey and white colour scheme sounds quite Scandinavian to me. These stories are great for inspiration: [A Dated 1960s End-of-terrace Gets a Scandi Makeover[(https://www.houzz.co.uk/magazine/houzz-tour-a-dated-1960s-end-of-terrace-gets-a-scandi-makeover-stsetivw-vs~77233568) and, a specifically living room related one: [How to Cook Up an Authentic Scandi-Style Living Room[(https://www.houzz.co.uk/magazine/how-to-cook-up-an-authentic-scandi-style-living-room-stsetivw-vs~74540916) Do you know what is under the carpet? If there are floorboards, you could paint those white (or leave them in their natural colour) to achieve the kind of pared back look in the photo you've attached.