The website of next year’s Finncon now has some info, most importantly about hotels (only in Finnish at the moment, though).
If you’re going to Finncon next summer, you should book your room quickly—Jyväskylä is hosting a big housing fare next summer at the same time as Finncon, so there will probably be a shortage of hotel rooms in the city (and the prices are already above average for Jyväskylä).
The main con hotel is Alba, located on a beautiful spot by the water, a bit away from the city centre, but only a short walking distance (about 600 meters) from the con site. The convention price is 94 €/room/night for a standard double room, 78 €/room/night for a standard single room, and 74 €/room/night for an economy single room. Superior rooms and suites with a sauna are also available. The prices include breakfast and parking.
There are more rooms in the Rantasipi Laajavuori. It is more remote—located a few kilometres away from the con site (about 5 minutes by car)—but on the other hand, it is a spa hotel so if you want to combine some extra relaxing with the convention, it might be a good choice. Prices are 92 €/room/night for a single and 102 €/room/night for a double room, including breakfast and use of the spa and gym.
A more affordable option is Gasthaus Laajis, four kilometres from the con site. Prices are 35 €/person/night in a double room, and 30 €/person/night in a 4-person room. You can add extra beds in the rooms fro 15 €/person/night, up to 8 persons. Breakfast is included in the standard prices; for extra beds breakfast is an additional 6 €. The hostel has shared bathrooms and also facilities for preparing food.
The reservation code for the con prices is FINNCON2014. The offer is valid until May 11 for Alba and Rantasipi (but it’s doubtful there will be available rooms that long). To get the special price for Laajis you must book the room by February 1.
Besides the official convention accommodation, it’s of course possible to book your room independently. There are still some vacancies in the Jyväskylä hotels, but the prices might be higher than what you’re used to. Milton is of course the traditional hotel used by Finncon attendees. I’ve got a room booked at the Alexandra (right by the railway station). The most inexpensive option (excluding hostels) is the Omena hotel, with current prices of 70 €/room/night for a double or 90 €/room/night for a four-person room (not including breakfast).
I’ve put together a Google Map where you can see the con site and the accommodation options mentioned here.