You can rent at the MOS Horizon Suites on month-to-month, but it costs more. I did this for 3 months. No one gets the cheap advertised lease rate. You'll pay about $16,000/mo on a one year contract, about $19,000 on month to month.
Don't accept their "offer" of a flat rate on electricity. It's more that your actual cost will be even if you run the A/C 24x7.
It's not a "serviced flat", it's furnished flat. There is no linen service, no kitchen utensils, you pay extra for (marginal) maid service, you pay extra for cable and internet.
The above comments about the pool, lobby, halls and shuttles are true. Plus the beds are only marginally softer than the floor. On the up side, the staff was always very friendly and helpful to me, and the ladies at the laundry service are kind, friendly and efficient. The showers have great water pressure. The people in Ma On Shan are friendly. The MTR is close. The Park-n-Shop in the lobby is a great convenience and the staff there are nice.
Ma On Shan is a suburb of locals, so many of the restaurants and shops are not easy if you speak no Canto and/or are overly concerned with looking like an idiot. I speak a little and don't mind looking dumb, so I prospered...
Website for contact info: Welcome to the Horizon Suite Hotel