It's sort of viable, but you'd have to spend 2-3 years living in overpriced temporary sublets while trying to save up to that deposit, and still it just supports the original comment which was that you could only afford 2 bedrooms and even that is a push.
To get one of those 600k apartments you'd have to flip your first apartment for the bigger downpayment, and that's gonna take another 2 years.