It depends on individual noise tolerance of the unit that you are intending to stay. I would advise if possible for yourself to visit the house before you make the decision. If you are afraid of noise, i would propose to stay a few blocks away so that the noise will not affect you and your family. Staying near MRT has it's pros and cons which you might have to consider after viewing the unit.
Please feel free to contact me for non-obligation discussions and i will assist you for searching your ideal house.