Lucy's place is at a perfect location, you're within walking distance to the city center (around 30 min), or even less with buss that stops just outside the apartment. The area can seem a bit rough at first glance, and there is a high probability that you will meet some local characters, but when you start to explore the area you will find great independent shops, pubs and cafés. The Shore became one of my favorite places in Edinburgh, a great place to relax away from all the tourists.
The apartment was very clean and had almost everything I needed, the only thing I missed was some more kitchen utensils such as a cheese slicer etc.
I shared apartment with Lucy's brother Harry, a very nice and hospitable person. He invited me out for a beer on my last night, which was very enjoyable. Lucy was also very nice and helpful since the beginning, she was available if I had any questions and gave me some recommendation on where to eat and drink, and some information on how to get around the city with public transport. She even bought me some local craft beer and chocolate to try out.
Totally recommend it.