The parlour palm is the most reliable palm for indoors .. Plants add exponentially to the indoors effect and personality, as has been said many times over, however as with anything, ideally should be placed/chosen tastefully and not in a hodge-podge or messy looking fashion. Unhealthy looking plants are particularly unattractive ..

@sasha.G, If possible I would move the plants in off the balcony but if that's out of the question, I'm afraid I would try to get a family member or a trustworthy neighbour to give the important plants a drink over that period. I wouldn't touch the succulents at all over that period of time, they can go for months without water as you already know, let alone a few weeks. Sometimes there are "house sitters" that can be paid to look after pets that otherwise would need to go to a boarding kennel, collect the mail, mow the lawns, water plants etc... Good luck. Cheers, Barbara

Not sure how it would go in Brisbane but what about trying a conifer? They grow fast and very tall. You can shape them or leave them natural. They are plain and certainly not tropical. Maybe speak to a local nursery and find out if they would grow in the sub-tropical climate of Brisbane first, as they are usually in colder climates (Sydney and south). Leightons Green Conifer – Leyland Cypress http://www.evergreengrowers.com.au/shop/hedging-screening/leightons-green-conifer-leyland-cypress/ Your quite limited if there's not enough sun and you dont use bamboo or tropical plants. Many other screening plants or hedges wont get tall enough for that space and climate. I hope you find something.

It’s a great idea, that way you can alternate whenever needed without too much fuss, your balcony looks quite spacious so you can have some beautiful pots out there with the added bonus of looking lush from the inside, love these wall circles too.