Really depends on the spec! There's a huge difference between the prices of beds, curtains, kitchens, tvs etc so you really need to to look at replacing like for like in your particular case.
Thanks to demovire who very kindly and usefully provided a link to rebuilding costs I was able to establish a more appropriate level of building cover. Additionally we re-thought the amount of the contents cover.
As a result the quoted price came down by 100 euro.
Additionally I was able to quote a price for the exact same cover from a competitor and that resulted in a further reduction of 25 euro - JUST BY ASKING!!!
My elderly friend now has 125 euro at their disposable and I hope they enjoy it!
Lessons learnt: Establish appropriate levels of building & contents cover and haggle over the price. It works!