The listing is the markup. Most of what you find online has an agent's cut built into the price, and the same building will quote you less at the door.
The deposit is normally one month. Electricity is billed on top and lands anywhere between 500,000 and 2,000,000 VND a month, decided almost entirely by how much you run the air conditioning.
Furnishing costs less than people expect. There is a second hand kitchen and home appliance shop at 43 An Thượng 29 in Bắc Mỹ Phú, which is how a lot of people here fill a place out.