My cottage interior design would be modern. I am fan of comfy modern sofa combined with rest of modern furniture. Fireplace is big must but it doesn’t have to be modern. Don’t cover support bem in cottage interior. They just looks so much better visible on the ceiling. Combine earth colors with brick and wood. You will blend your interior with nature and whole design will look so much better.
When you searh your decoriation try to get some organic shapes, maybe some natural materials also. For example – buy yourself lamp made of Wood and beige linen. I found one produced by company Danform.
Oak is very trendy this year. Combine it with white, beige, brown and little black. Put some nice sofa near your big window and fill your batteries and relax from hard work. You deserve it