I recently had a 3 night stay in a self catering flat.
On arrival ( around 7pm) we found that the toilet flush was broken, I mean completely broken, and as the cistern was fully enclosed behind tiles, there was no way of flushing the loo.
I reported it straightaway to the 'help' team but nothing could be done that night. So I found a bucket and had to fill it with water from the shower to pour down the pan as and when needed. I had to get up several times in the night to do this for my elderly travelling companion who lacked the physical strength to do this when she needed the loo in the night. I also had to 'flush' the loo for her during the day too. We did go out from about 11am.
When someone did come around the next day, I was told it couldn't be repaired during our stay. They then unlocked a third room, that had an ensuite. So we used that for the rest of our stay. ( the ensuite hadn't been cleaned and toilet was urine splattered - fair enough, as it would have been out of bounds normally)
IABU to request a refund equivelent to one third of the cost i.e. the almost 24 hours when we were without access to a properly flusing loo? The amount I'm requesting is £164 ( the 3 night rental cost £491)
YANBU: it's reasonable amount to request as a working toilet is a basic necessity and you only had access to one for two/thirds of the stay
YABU: stop being so grabby!