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.

Hi Robert You have a lovely well lit space as for entertainment cabinets we are loving the Coridoor series BDI Media Cabinet. Having a low lying cabinet allows you to keep your sense of space whilst hiding your home theatre equipment and cords. The Oak Media Cabinet works well with your beach theme too!

As for interior designers, I don't know any in your area but you can find some on Houzz or look into online interior decorator. A friend of mine used ' Havenly' with great success. Here's a good article about those services on apartment therapy here :https://www.apartmenttherapy.com/online-decorator-makeover-we-tried-3-internet-design-services-to-decorate-this-rental-241478 You can also ask the Houzz dilemma community and they will be very happy to help you out!

What is in the second photo, a power point? And you think the tv socket is going to be in that same wall? Then that is where the entertainment unit goes. Is that the only power point? When you buy your entertainment unit choose something which allows access for plugging in the vacuum cleaner. Unless you have a rechargeable vac which doesn't need a power point. With hard flooring perhaps you will mop more than vac. Although if you want to soften or warm the space you might have a rug? I didn't understand "combination of bright and neutral colours" until I looked at your Idea Book. You have some lovely pictures there. Do you have any artworks yet? That might influence which colours you repeat throughout your space. The grey sofas are probably the most versatile and timeless, and something like that might be the easiest to source in a size and configuration to suit your needs.