We stayed at Murphy's Place for 3 nights in June and had a great time. If you don't mind a bit of extra walking, all of Edinburgh's main sights are easily available to you (there's also a lot of bus/public transportation option, although we didn't make use of them). The apartment is well-equipped, especially if you're planning to cook/eat some of your meals in-house. There were 6 of us total and we didn't feel cramped, even with four of us on twin beds. We would gladly stay here again should we return to Edinburgh.