I attempted a homebirth with DS at 40+5. Sadly, the little sod had other plans - waters didn't break until I was fully dilated, at which point they discovered a lot of meconium, so had to transfer to hospital. Had a very long pushing stage and his HR started dropping so had to have an episiotomy to get him out, at which point it became apparent the duration was probably on account of him being a compound delivery (came out with his hand on his chin). X-ray confirmed signs of meconium aspiration so we had to stay in hospital for 5 days while he completed his course of IV antibiotics. So, yes, things don't always go to plan...
Currently 27 weeks with DD and have stated that homebirth would be my preference, so the experience hasn't deterred me. Like you, I have a strong dislike of hospitals (spent a painful amount of time visiting my best friend who was terminally ill in hospital nearly 20 years ago). And, as far as I am aware, being in an environment that isn't conducive with you feeling at ease can be counterproductive to the progression of labour. So, my advice would be to talk it through with your MW so that you have all the facts and can make an informed choice. It sounds like you're low risk and have previously managed unmedicated, so you know the score (and, yes, they do bring entonox) but just be mentally prepared that you may need to transfer.
And please, ignore the ridiculous comment about needing a high bed. I don't know what century some people are living in, but the person giving birth isn't responsible for ensuring the comfort of healthcare providers and, in my experience, they typically encourage you to birth in whatever position you feel most comfortable.
Wish you a smooth delivery, wherever you choose to have baby. X