Reply to Acoustic Treatment and bedrooms

so do room I live is really bad in terms of acoustics I suppose, walls are very thin and floor is thin as well, people downstairs can hear you walking pretty much if you walk a bit hard. So how would studio monitors work in that case? Would it be only good for arranging and composing, and not good for mixing&mastering later on?

So shall I get studio monitors and mix with my headphones?