By plane: the most convenient airport is Halle-Leipzig – from there it is about an hour and a half by train (go to Leipzig main station and then take a direct train to Jena). It is also possible to fly to Berlin or Munich or Frankfurt, but then it takes about 3 to 4 hours to get to Jena.
By train: regular ICE services on the line Munich-Berlin. Alternatively, the ICE line Frankfurt-Weimar brings you close to Jena (change at Weimar onto a local train, which takes only another 15 minutes to bring you to Jena West). See also www.db.de. Upon arrival at either Jena Paradiesbahnhof (with ICE) or Jena West (Regionalbahn), head towards the Intershop Tower (simply the most prominent building in town) and you are in the midst of things.
See also the travel-information at: jena.de - Travel Information.
Getting around in Jena: Jena proper is very small – the Jenenser actually consider only the square mile that was within the medieval city walls as 'Jena' proper. The university campus, the main building, the restaurant Zur Noll and most of the hotels are all within 5 to 10 minutes (or less) walking distance from each other.
Here a selection of conveniently situated hotels:
Hotel Schwarzer Bär (55-75 Euro per night single room)
IBIS Hotel City am Holzmarkt (69 Euro per night single room)
Restaurant & Hotel Weinbauernhaus im Sack (Euro 60 per night for double room if used by one person only – only 5 very nice rooms available)
Hotel zur Noll (rooms available from Euro 70 (single) to Euro 90 (double comfort) – right in the middle of the old town)
Hotel am Stadion (33-51 Euro per night single room; a little bit out of town [two stops with the tram – or about 10-15 minutes to walk])
Hostel Jena (rooms available from Euro 25 (single), Euro 20 (double) and Euro 17 (quadruple) – very central and the cheapest offer in town)
Food will be moderately priced (you can get a very decent and filling meal in a normal restaurant for 10-15 Euros; cheaper at the Chinese and Vietnamese restaurants) and I booked tables at a traditional inn (Zur Noll) next to the University Main Building for dinner on Friday and on Saturday.