This is definitely not big enough for three adults to fit comfortably. The bunk bed is youth size; it's very small and not easily manageable for less limber adults. We 3 felt very cramped in the room. Be aware that it is definitely a room in a house, not a separate unit. Also be aware that breakfast is continental style rather than full Scottish.
David is a very interesting fellow with lots of great stories to share. He's genuinely kind and friendly.