We spent 2 & a half weeks in Mark's place in Collingwood and couldn't have asked for a better experience. The building is an absolutely stunning warehouse conversion, and the apt itself is decorated with impeccable taste! We loved having a record player on hand, and all the cookware and kitchen tools were great. Washing machine was also a plus. The apartment had so much storage that even if you have a fair bit of luggage, its really easy to keep it out of sight and tucked away.
We loved the ease of access to the building and the unit and not having to fuss with keys. Although everything went smoothly, Mark was super responsive to any questions we had throughout the stay.
If you're thinking of coming to Melbourne (particularly for overseas visitors), this is also a fantastically central neighborhood that is out of the noise of city downtown but still walkable (15 min away on foot). Surrounding Collingwood and Fitzroy have SO many restaurants and gems. :) Would stay again for SURE!