Have you tried asking the carpet people for advice? The pet wee may have soaked into the floorboards so could get into the carpets -- some kinds of underlay may be better than others. We had cat wee that had soaked into skirting boards in a previous house and had to have the boards replaced. Possibly a surface sanding of the floorboards may be necessary? Would be a big job though . Possibly you could spread fine cat litter over the worst affected parts and hoover up?
yuk. Not what you need. I would suggest delaying the carpets but that may not be an option.
re the toilets, if it is limescale caked with other substances, oxalic acid does the trick. It is BAD stuff so be careful. (How do I know this? Moved into accommodation previously used by mummy's little darling who hadn't been taught to clean toilets)
I'd but a generous sprinkling of bicarb of soda on it and leave it overnight then sweep/vacuum that up - it does tend to remove most smells - it's what I used when potty training and clearing up after poorly children.
We're moving into a rented property and the previous tenants have left it in a right state, the whole of the upstairs stinks of dog or cat piss, I think they also kept hamsters. Ive scrubbed the floorboards with bleach and then again with disinfectant but I can still smell it, its not as heave inducing as before though. We are having carpets fitted next week and I want the smell to be gone by then, would carpet vac sprinkled everywhere do the trick?