We have incredibly hard water, no softener and lots of mineral deposits on everything that touches water for any length of time. The solution is incredibly simple: white vinegar. It very simply and easily and gently dissolves the minerals. We had a shower head that my husband was ready to replace because the mineral deposits had clogged it. I unscrewed the head, submerged it in a cup of vinegar for 24 hours, rinsed it off and screwed it back on. Voila! Like new! I have tried CLR: worthless. I have tried abrasives: all they do is scratch and don't get rid of the deposits. Another spot where minerals accumulate is around the kitchen faucet. I take a bunch of paper towels, soak them in vinegar, then pack them around the faucet over the mineral deposits, keeping them good and wet with vinegar and let them sit for about a day, more or less. Rinse and wipe clean, will look like new! Our cat loves water. His favorite thing in the world is if I fill the bathroom sink with water and let him play in it. What happens? Water spots all over the mirror. Wet a cloth, add a dash of vinegar to the cloth, wipe the mirror... clean and shiny!

I would paint the entire fireplace including the mantel, all trim and shelving white. I like the Whisper White, but you must bring the paint samples into the room to see for yourself. The sheen on all woodwork should be semi-gloss, easy cleaning and looks crisp. I agree with painting the walls and I would paint the part above the mantel the same color as the walls, Summer Hue is beautiful, but once again I have no idea how that would look in your room. The walls should be flat most brands make a fairly easy to clean flat. If the fireplace were the focal point of the room, it could look very cool and dramatic to paint it a very dark gray almost black. But at least in this picture it seems that the entertainment/shelving unit is the focal point. hmm .... better stop while I am ahead.

Just a little ceramic information to share as a potter. Vitrified simply means the clay has become glass like by being fired to its proper maturing temperature. Usually ceramic tile means it is a lower temperature clay like earthenware or terra cotta. Porcelain is fired to the highest temperature and is more vitrified if you will. This usually means it is less porous to to absorb water and harder. Low fired ceramics with glazes much darker or lighter than the clay body will show chips easier. Rectified has to do with making the edges precise enough to fit smoothly together for less grout lines. So porcelain cost more to produce but it is more sturdy. All clay tiles should be vitrified.

I love dark shades but from my experience oil stains on a dark shaded cabinets in kitchen specifically are more prominent.