Was this normal behaviour while we were away?

Hi all, well as most of you know we just got back from our hols, been away a week. My neighbours looked after the kitties and other animals, well the kitties were a bit naughty (well very actually) They decided to use our lounge and kitchen as a litter tray even though they had their own, our neighbour said there was poo after poo and when we got back underneath out tv was swimming with cat pee, even though our neighbour had cleaned some up that morning. As you can imagine it smelly quite bad and I have caught 3 of the cats trying to do their business in the kitchen since we got back. I have put it down to stress of us going away as we haven't been away in 8 years so our kitties have never been left. Hubby isn't too pleased though and he keeps moaning about the smell. I bought some urine nuetraliser and I have used that several times but I can still smell it, we're moving furniture around and going to give the floor another scrub today, is there anything else that I can use?
The worse behavioural change is Harvey though (he's our newest cat who we had off the lady who lived here before) when we first had him we introduced him slowly to our kitties after we had him fixed and health checked, at first he used to chase them and be quite aggressive, he is only one and a big baby, I think he wants to play with them really but they don't see it like that. Well we just got him calmed down to the point where we could go out and leave them all in a room together and the other kitties started to tolerate him well. The problem is since we have been back he has turned aggressive again, infact he's worse than before, he chases all the cats pulling clumps of fur out, Smartie hates him and hides from him. If I try and stroke him he smacks me with his paw, he has huge paws and it hurts, he is just dominating us all at the minute and I don't know what to do? Maybe he didn't like the fact we left him as his previous owner just dumped him and hopefully he will calm down in a couple of weeks, any advice would be appreciated, thankyou.xx

Harvey is a monkey, totally! I think a re-introduce t will have to be, you shoul see my black (yes black not my choice was here when we moved in) stairs and landing carpet, he's been chasing the other cats and its just covered in fur, I need a new hoover as mines about blown up. Billy I don't think is a problem, he has never peed and is so laid back I am suprised he can stand up(love that man cat) Tonight we have moved everything out of the lounge and used the urine nuetralier (it is an enzyme cleaner) all over and the difference in smell is amazing, hopefully this will help. Thanks LDG for the tips on feliway and Bachs, I like the sound of the vailla and I will get some.
Harvey I always try and cuddle and fuss him but he just attacks me at the minute, he's like a boxing cat. My hubby said he is fed up of him and if he doesn't improve he will have to go :-(, there is no way I would let that happen though (would rather kick hubby out) and yes patience is the key. xx

Oooh great, thanks for that will have to go saturday, theres a pets at home about 15 minutes drive away. Have just noticed my spelling, how awful, must be the wine The only other places I have noticed feliway on sale is at my vets and its dearer than alot of other places. x

Airfreshener I would have thought the same too, I will buy it not tell hubby how much it costs and he will think its an air freshener x

Thanks, I have used rescue remedy myself and I got it from Tesco, it is really good, I had no idea that you could use it on cats.x