I noticed that some of you are going to stay at hotels near the train station,this is the only" bad" area in the city so it is better to avoid the bars around and anything that has to do with offers for paid sex etc....
The city is very safe generally and even around the stadium i dont think that you are going to have any problem with ARIS fans.We are very loud but generally very friendly at European games.
If you stay at the city center generally you can very easy walk around.To come to the stadium my advise is to use a taxi wich will not take you more than 10 euro.Taxi from airport though may be around 30..
For english type of bars dont expect many things as here the culture is little different....i post some here..<a class="postlink" href="http://www.beer-pedia.com/beer_bars/beer_bars_thessaloniki.html" onclick="window.open(this.href);return false;">http://www.beer-pedia.com/beer_bars/bee ... oniki.html</a>
There is also one beer place under the ARIS stadium(BEER FC 1914) ,mostly for ARIS fans but with cheap prices and very good punk and metal music....I am usually there....:-)
I hope you will find my post helpfull,have a good trip and enjoy your stay in the city of GOD.
ARIS FC 1914.