Can't recommend enough. Martin & Weng were very communicative before we arrived but at the same time very hands off and everything including check-in is self-service: this made for a very relaxing and straightforward experience which suited us perfectly. The flat itself, honestly, normally photos of accommodation we stay in are too favourable but if anything the photos of this flat don't do it justice: it's really lovely and furnished to a high standard, with a great TV, and some nice touches from the hosts. It's also nicely located: far enough out of the city centre that it's quiet but close enough that you can walk right into the middle of things in less than 15 minutes. It's also round the corner from some really nice restaurants: we had a very good meal at "Kenji Sushi" one night.
Honestly the only thing bad we could say about the flat is that we don't own it ourselves: we'd definitely like to go back there rather than try somewhere else next time we're in Edinburgh if it were free.