We have a house that has been converted into 2 flats many years ago. The downstairs flat has a garden so when the flat became vacant the upstairs tenant asked to move downstairs. We were quite happy with that, she was a good uncomplaining tenant.
We let the flat upstairs to a very young couple (Dad had ADHD) who were expecting a baby any day. Nobody else would give them a chance so we said we would. Big mistake. After the baby was born my downstairs tenants were besides themselves with the noise. Dad was like a baby elephant and when the baby cried in the night, downstairs could hear them argue about who was getting up, clomping across the floor, etc. The lady downstairs was also very embarrassed because she could hear every noise when they went to the toilet and she realised that, for the past 5 years, the downstairs tenants must have been listening to her!
I'm not sure that the council could have done anything if there had been a complaint but as a Landlady, I felt duty bound to make their lives more comfortable. We soundproofed under the floor boards and we laid extra thick underlay under the upstairs carpet to muffle the noise. It cost about £500 but it was money well spent. Unfortunately, relations between all the tenants were well and truly compromised so the young couple left.
Estranged Son and Future Granddaughter
To think that London, or anywhere else for that matter, does not belong to any one demographic