Not in mobiles, but in very cheap hotels we've been 'victims' of disposable bedding, and it was truly horrible. I would rather take my own, and vacuum pack it to save room, or even buy cheap stuff there and leave it behind - but wouldn't 'rent' disposable bedding. We got some very nice stuff from SuperU (their value range for just a few euros) when we had overestimated the number of sheets we'd left in the caravan - the true number being 'None'!
We have had packs of 'proper' bedding provided with some mobiles but it's never the sort of quality I like.
We have been supplied with it in a static and like Val found it horrible. Fortunately we had our own bedding so did not have to use it. Should imagine its like sleeping in a packet of J cloths
Don't forget to leave a review of the French and other European campsites you have visited!
I think most statics come with their own pillows, blankets, etc., and you just take the cotton bedding, so I would think the easiest way is to buy it there if you haven't room. I think we paid only about 12 euros for a sheet and two pillow cases - as I said the SuperU value range, bought from a small SuperU in St Pons de Thomieres. They were so good we went back and bought some more to bring back home and they wash beautifully. There are a lot more expensive types, but we found the cheapest more than adequate.
Lyanabint is exactly right - it is like sleeping in JCloths (or those paper rolls they pull out on hospital beds).
We had some provided by a campsite last year, and we did put it on the beds, but used our own sheets and pillowcases on top of it. It was quite soft, and if we hadn't had our own, I think it would have been OK on it's own. Obviously there are different brands, others may not have been so lucky.
We take pillow cases, fitted sheet and a duvet cover. If it's hot we just use the duvet cover and if it gets cold we put the provided sleeping bag, duvet or blankets in the duvet cover.
800 thread count, Ollie, now you're talking serious money!
I think our budget SuperU bedding was perhaps 200 (if they counted the threads at all) - but really good quality for what we paid, and it washes and irons beautifully! Worth looking at as a cheaper alternative to your 800 thread count!
Take old bedding and abandon it. Relatives often have washed out or outdated colour/pattern sheets they don't use but are reluctant to just chuck. Or raid charity shops and boil wash before use.
We frequently take our oldest quilt/pillows and abandon at end of hols, creating useful space for wine on return journey. We then buy fresh bedding for the autumn - annual cost about £15-20.
Keep meaning to abandon 30 year old sheets/pillowcases too but have chickened out so far and used them to pad out said wine bottles!