Sonja's greeted me nicely even though my flight was delayed and I therefore arrived very late. The apartment is nice and extremely convenient if you are visiting the Messe ! Also just an easy 5mn walk from the U Bahn station ! I have stayed in many many hotels and I must say I've never seen a place so clean even the bathroom looked like it way being used for the first time ! You will save time on your business trip if you stay at Sonja's and no taxi fares, just a short to the East Entrance or 10 minutes of fresh air for the West entrance.