My in laws are too intrusive?

its been a year since i got married. i have recently shifted to the same city as my in laws'. they stay just 4-5 kms away from our place. before moving into our house, we got the house renovated. the problem is that my in laws are too intrusive and keep giving unwanted advice on almost everything. they keep finding faults with the work done in our house, with our dealings with people and advise how to take care of the household which we find very irritating. both of them are very cynical about people. my husband is in a touring job. he had to go out of country 3 days after we moved into our house. even after he left, not even a single day has ped when they dont drop in (esp my dad in law) and they mostly come unaanounced which i find intolerable. another problem is that they treat my husband as a little kid which i feel is my husband's fault too coz whenever he's out of country, he designates them certain tasks. i already had told my husband that i want his parents to call up b4 coming but now he is just ignoring the issue. i dont know how to deal with the situation. i dont wanna spoil my relations with my hubby by cribbing abt his parents all the time, nor do i want my in laws to take advantage of my nice nature. besides, this city is new for me and i hardly know anybody here so i dont wanna annoy my inlaws too. i also know that my husband will not say anything upfront to his parents as good or bad, they are his parents. what shud i do to make them realise that we are grown up people and we have our own life. so they shud stop interfering in our lives and stop treating us like kids. also, how to tackle their fault finding habits? i'm a polite person who finds difficult to say 'no' to something. pls suggest what shud i do and what kinda language shud i use so that they get a message that their unwanted advice, criticism and unannounced visits be stopped.