We (1 couple and four adult) had very nice time at Katie's place.
good points
very close to statin, shops and Portobello market.
living room is very comfy and has sunny nice little terrace.
very good washing machine and dryer.
unlimited hot shower - careful for setting. it could run very hot.

point needs to be mention.
room with bunk bed is rather small, not suitable for two adult sharing, I think.
lot's of stairs till the house door.
overall, I can recommend her place. Katie send me few e-mails while we are there, it felt us that she care the guest very much and willing to help.