This is true, it totally depends on the landlord. Some require wifi and TV payments, others do not. You have to pay for electricity though, and here's my advice to you at this point.
First off, try to ask to see the bill. Most landlords will refuse (of course), but at least you can try. The thing is, the average electricity consumption bill is about 15000dong, while landlords may charge up to 35000.
Then ask to see the meter that keeps track of your electricity consumption and keep track of it yourself. It will certainly help you save loads of money.
Anyway, do not believe every word landlords say, always ask to see the bills before paying for anything! Good luck