I think your tiles need to be larger. Choose an interesting, but simple pattern similar to the one below. I also like the idea of something that is from the region you live. Without seeing your space it is hard to know. You say a stone fireplace, what kind of stone? You want the tiles to go, but to make the fireplace stand out do not go too matchy. Mixing concrete with the tiles can create interest, too.

Umm, I think you could afford an interior designer! But as I'm awfully generous with my pearls, here goes. The lower balcony is an informal extension or your living areas, and will probably count as living floorspace more often than not. I would include an outdoor kitchen along the side wall, and install a floating timber bar top along the balcony wall, as a drinks bench or informal dining slab overlooking the city skyline. At the opposite end a vertical garden wall and a grass carpet, turf lawn rug in that area. I would introduce round outdoor furniture to encourage relaxing, perhaps exterior grade beanbag or more contemporary rattan tub chairs, with charcoal upholstery. Ones that can rotate to face your flat screen when entertaining. So one end is lounge the other dining, although not sure a table would be needed as the dining area links from the inside and doors can open Ruhr up, so the bench and stools is all I'd do, to keep it feeling light and spacious. Use bold and bright pops of colour in cushions along a built in timber slatted bench at the lounge end along the balcony wall, build this is a seat with storage capacity running almost full length stopping a t the mid wall section, change direction so it's an L shape, with the L a planter box also in slatted timber, but filled with plants like ginger plants. Tis will act as a divider between both ends but not all across. Upstairs as it's huge, divide with a slatted wall, perhaps with stainless steel mirror sandwiched here to reflect each end, my reason is to give both bedrooms their own private balcony. Box furniture each end, and Provide a pull out line both sides of the screen. Mobile planter boxes on castors so they can be moved for sunlight. Let these two separate decks be an extension of the personal bedrooms, with individual colour and finish. Although I'd paint the inside of your balconies in a concrete grey so they disappear into the horizon. Try horizontal bands of grey, graduating from charcoal at the bae, then into lighter greys at the top, take your colour cues from the city skyline.

When you click the 'photo' option below this comment box, does it pop up with a screen whereby you can choose a photo to upload, or doesn't show up at all? If you're able to choose one, and the little green wheel keeps spinning for a long time trying to load, it may be because the picture is quite large in file size. Maybe try and let it load for a while and go make a cup of tea :)

Any photos?