I'm trying to choose a carpet ATM for most of upstairs but have never bought one so don't know a lot about them. I have been looking at 100% wool in a boucle.

Questions : is a boucle easy to hoover? my mum inherited one but with a much looser/larger loop and she says her Hoover doesn't get everything up and she would avoid at all costs.

Everything I read seems to point to an 80 (wool)/20 (PP/nylon) mix being the best option. What I don't understand is why though given the properties of each?

Finally for cost reasons I was looking at having a carpet cut and either whipped or adding a border to make a stair runner. I've got 3 "platforms" on my stairs so for it to work properly the carpet would need to be cut at a diagonal on the "platform" as per the photo. Has anyone had this done and if so how/when were the whipped edges/border treated and how have they since performed?