I'll give you my random thoughts about this.
I do not like microwaves, because I am not sure what it does to the food~yk? It does decrease nutrients AND it makes it more acidic...once in a while I do not think it is awful like anything else. We have a micro that I want to replace with a small convection oven...it is only used on a rare occasion to heat up a hot drink..maybe twice a month. (I am sure dh sneaks and uses it when I am out of town...haha)
I do not worry about having a micro in the house for the whole electromagnetic radiation thing...My husbnad is an electrician, has worked with satellites...knows all about waves, frequencies etc...and assures me it is not a prob.
If you have a micro in the house, there is always the temptation to use it. (hence the heating of hot drinks twice a month)
I say it is no biggie, and it would be a nice thing to concede to a roommate to keep them happy.
SO there...lol!