Dear Mr and Mrs Harris，
Welcome to our neighborhood.You must be excited to be in a new house.However,
Would you mind not listening to music too loudly?Could you please not play the guitar and talk on the phone too loudly?Because I have to study.Could you please not drop the litter outside the window?It is too dirty.I can't stand!As for your son,Would please not playing football at home?
If you do them ,I will very thank you for you.Last,I hope you have a great time in new house.
Yours sincerely.