It's no secret that London is one of the world's most expensive cities. Indeed, this tiny studio apartment is currently up for grabs for a staggering $852,700 (£630k). The same size as the average tiny home, the flat offers a kitchen, lounge, dining space, bathroom and bedroom, all squeezed into 550 square feet (51 sq m). Residents do, however, gain access to a roof garden, the highest private gym in Europe, a cinema and a concierge service – but of course, such luxuries come with monthly fees!