We had a lovely time at Mo's during Hogmanay. We usually cabbed into town or walked, as it was just a 25-30min walk to the main parts of Edinburgh. Calton Hill wasn't very far either, so we had a nice walk by there as we walked to Holyrood (20min walk max).
Mo was great to get in contact with (even when I had an issue getting her calls as the app still listed an overseas number). Her flat was clean and bed was super comfy. We slept til noon one day because we didn't want to get up.
Would definitely recommend Mo's place if you want to be nearby town centre, but just far away enough to avoid all the noise of a city centre.