Jana's place is truly a home away from home. You should definitely go for it, if you travel within a large group. We were 5 and everybody had privacy and place to have some rest. Two bathrooms are the perfect solution to accelerate morning gatherings. Moreover, in case you like having a proper dinner you will have literally everything for that: well equipped kitchen and a large dinning table.
Apart from that, the location is great. We spent about 15 minutes to reach either Holyrood Palace or Edinburgh castle. Needless to say that Royal mile is just around the corner. Moreover, there are TESCO and Sainsburys near by, so there will be no troubles with getting something to eat.
We would definitely recommend Jana to anyone =)