We spent with a friend of mine 5 days in Thessaloniki, and we would definately recommend it. The appartment is value for money, it has everything you need at a great location with a great view -tones of sunlight if you open all windows. Not noisy at all, suitable as and cozy during winter time.
The hosts are quick to reply both before and during your stay, and extremely polite as well as helpful.
We even got locked out of the appartment (do not try it) nevertheless one of the hosts came immediately to our rescue, spending more than an hour to try and assist us, which he eventually did.
If we ever return, we would choose it again without a doubt!