Aroundtheworld, they are not bad kids, and we do have rules which they do abide by for the most part. They had no structure whilst living with their mother, even simple "duties" were not instilled in them. They now do their own washing and put dishes in dishwasher, occasionally emptying it (well DSD does). Being typical teenagers, their rooms are untidy, and we have to tell them to tidy up, Hoover etc. but I suppose that is normal in any household.
I do feel like I have lost my own home, and as the communal living area is small, including kitchen, we do all get in each others way.
Redhen, the kids behave ok with me, but I have tended to detach myself from them somewhat over the past few months, so there is often tension. DH and I have had several fraught times since they arrived, so I have had had to change my attitude and personality just in order to be able to cope with everything, so I constantly feel in a position of compromise, something that does not come naturally to me!