Cooking on 4 smoking rings

Ah yes, we have four rings, but they smoke. Is bit unnerving as grey spirals of smoke waft ceilingwards to meet non-existent smoke alarm in kitchen. However, oven does appear to work, that is to say, it heats up..........eventually. Think landlady and husband are definitely taking the piss if you will excuse the vulgarity. They are an odd couple, the first time we met I had her down as a jovial hausfrau with rosy cheeks and hearty manner. This time, as her grumpy spouse heaved the new (ahem) cooker into the kitchen, she revealed to me that she had been very poorly since Christmas, in fact she hadn't been out since Boxing Day. She did look a bit pale, and her demeanour was subdued. They seemed to deeply resent providing the cooker, God knows where they found it, it has a door of a different colour to the rest of it, (this is not a designer door), and someone has painted the top with what appears to be white emulsion. Then as we watched Grumpy Husband fiddle with the electrics, she told me she hadn't agreed with the agents to the amount of rent we are paying! As I was standing with mouth open, husband whisked open oven door, and stuck for something to say, I commented how clean the oven looked. He replied that it wasn't clean when they got it. I am certain they found it on the local tip. As to the rent, this will have to be addressed.