Heels and beryl, I agree. For every bad landlord there is at least one bad tenant! BUT there are bad landlords that get away with a lot despite all the rules and regulations.
We had no heating for five years and no gas safety certificates. We stayed because we have a dog and he was the only house we found that would accept him. Turned out that was only because the agent told them he was a small dog. He was small at first, then he became a 9 stone rottweiler.
I asked for the hearing to be fixed as it was August and I had a baby due in sept. Couldn't have another cold winter. I had t heard from him in four years before then. He said it did work and I should stop moaning. He turned into a dick. Heating was not fixed. When DD was 2 weeks old he gave us an illegal eviction notice telling us to move out ten days before Xmas. I called the council saying he had no gas safety certificate and we had no heating. His wife came round pretending to be my best mate.
She said she agreed we should have heating and fitted a whole new central heating system. I said I didn't want all that work around my newborn. Dust etc. she didn't care.
We had a new shower fitted when DD was a few days old. The shower fused the whole house and we had to wait for western power to come out. I had emcs and the birth was extremely traumatic. I struggled with Breastfeeding for the first few days so supplemented with formula. I had no electricity to steralise, boil a kettle etc etc. I can't tell you the panic I felt when I knew I wouldn't be able to feed PFB if she needed it. I was an extremely nervous first parent and couldn't eat for over two weeks because of the fear I was doing it wrong I called the landlord to report it. He said, and I quote 'that's not my problem, I'm out for the day. I'll sort it tomorrow but it's not my responsibility. ' I can't tell you how I sobbed.
By the end the arguments were so petty. The doors had never fitted or closed fully. She wanted new doors to come out of my deposit as they worked perfectly before hand. I had to remind her the primary function of a door was to open and close.
We decided that as they could get a 20k fine for no has safety that we told them we'd report them if we didn't get full deposit back. We did get full deposit back 
Some people shouldn't be landlords. Some people are great at it.
Sorry to have written such an essay. I own a house now with DDs DF and I'm so grateful I won't have to go through all that again