Hi!
I ve been living in Yangon for 9 years and cost of living is nowadays really high.
Appartement rental is extremely expensive compare to other south east asia cities.
A furnished apartment (but not really european standard) without lift or car park will cost you at least 700 or 800 US a month
A decent condo at least 2000 US a month.
You ve also to pay 6 months or 1 year rent upfront.
A service apartment will be even more expensive ... 3400 US a month for a 34 meter sq (residence 26, myay nu st, sanchaung, Yangon).
To rent a car without driver, 300 US a month.
You ll spend around 150 US a month by taxi.
Hope it can help