(1) 係咪在香港做過的bun 都唔好請?
It depends on the employer. I am a lazy mother and love super helper. Of course, this old seafood with HK experience also gives me black face. I am ok with that as long as everything at home is in good order.
(2) 如果每次只做2年contract(total 3 contracts), 沒有再續約, 是否有問題?
Think employer would renew if maid is not very bad. See if you can get her ex-employer phone number and ask directly.