We are three friends who stayed here for vacation in March 2016. The location is superb, if you like to be in the centre of the city close to the waterfront, standard shopping, a main market, nightlife and some sites (e.g. churches). If Thessaloniki were London the apartment would be, geographically, like staying on The Strand. Despite the central location we experienced no problems with noise at all. The apartment is about 5 floors up, and has a balcony that was decent for overlooking the main street and a taverna/restaurant below.
The apartment is well furnished, and was comfortable for three men staying togthether, using a main bed, a sofa bed and a large couch. The kitchen is OK, small, which is only a problem if you plan to stay in and cook extravagant meals each night. Otherwise it works fine, with fridge/frezzer/microwave. The bathroom is also small but worked OK for us. The host (Sophia) was very helpful, relaible and pleasant, and was able to help us out at least twice with information after text messaging her. All-in-all I recommend.