The wifi does absolutely work at my place, but sometimes phones are not as good at picking the signal up in the guesthouse and I mention that to all my guests. I've had guests who streamed movies onto their laptops in the guesthouse without any problems! Moreover, I offered Rachel the use of a guest room in the main house if the signal was not good enough for her purposes. I work online myself and have never had problems with it, whether on my desktop computer, tablet or phone.
As to the "one hour by foot..." Hello? It's a 15 minute walk to the nearest mom n pop grocery store (three actually, plus a little cafe) and there are buses running all day long to go into town in either direction. Rachel makes it sound like the place is out somewhere in a wilderness when it's actually right on the main road and a two-minute walk from a bus stop!
Rachel slept in the smaller loft, which has an old-fashioned batting mattress as it is intended for children (although couples have slept there more than once and no one has complained). The main double bed has a standard mattress that is less than a year old. Sounds like Rachel did not try it.
When I went into the house the next day, even though the heat had been turned off, it was warm as an oven. The cottage has floor heating and a separate space heater, which could have been brought into the sleeping area if Rachel found it too cold. I've had people staying in this cottage in winter time for a number of years and people found it warm enough to walk around in a t-shirt and jeans inside.
Rachel left without any notice whatsoever, like a thief in the night. She never talked to me again after the first evening and only informed me in the late afternoon the second day via AirBNB that she had checked out, even though I was at home when she left. Very disappointing experience for me.