I've stayed at Kathy's for 3 nights and I felt really comfortable. The bedroom is really cozy, warm, and just like the pictures show, it's a good place to have a great night sleep.
The location of the house is good. Really near to Arthur's seat and 30 minutes away from the city centre by walking and 20 minutes to portobello beach walking as well.
Even though I haven't seen Kathy nor her son that much, the time we saw each other they were really gentle and welcoming from the begining.
I would definately recommend you staying at Kathy's!