Cost of living- need updated 2015 infos in USD of costs in Lima

I know this has been asked in other threads, but sometimes the information is outdated or not given in US dollars, so I do not understand it. Could you please help me with some info about estimate cost of living (in $ please) in Lima? I know it depends on the neighborhood and lifestyle, so let's say middle class, nothing fancy. Just food and services (power and water(. Thank you

If you want to live in a room 150$ per month with internet, water, power and maybe cable for you TV (if you have TV)
Food Restaurant: 300$ per month (breakfast - lunch - dinner)
laundry:  I dont know, but I think is not expensive.
BUS: 0.50 dollar if you want to move to different places. PER BUS.

if you have any question that I can help you, let me know

Thank you. Well, I am not thinking about restaurants, just going to the supermarket, looking for discounts, etc, nothing fancy, for two people. Maybe around 350 dollars per month? Living in Lima not in a small town

I was thinking in a room(Just bed ) if you want an apartment 650$ to 8000$. You could find that in La Molina.
And all that places are in lima :) . dont forget that you have to pay water, power and all you want.