Mascara found on bedsheets which smudged when I dampened- so it was not stained, and therefore must have been unwashed. I was far too tired to complain that night so slept with it, though I could have solved the problem as they do have 24h staff. The next night I mentioned it to the staff who gave me sheets to change it, however it was only when I was back up in my room that I realised they had given me two sets of mattress sheets instead of a quilt cover. Although unintentional this partially worked in my favour as the rooms get quite warm.
The hotel itself is converted student accommodation, so you can imagine the rooms are quite small. The benefit however is that they have facilities many hotels would not offer.