It was my first time in Edinburgh and I stayed for 4 nights at William's apartment , and everything was PERFECT !
The room was super clean, spacious, quiet and comfortable, it has its own bathroom which is great. We're allowed to use the kitchen too and it's very practical.
The apartment is well located, near to bus stations , restaurants, markets ... and from 10 minutes by bus to Princes Street.
Even though I haven't seen William, the check in process and communication were very easy , he was informative, helpful and replied quickly to text messages.
I highly recommend his room :)