Hello Irish, a few tips for Your summer journey to Poznan.
First, if You are determined to arrive by air, consider as the alternative to Lawica (Poznan's airport) flying to Berlin and then renting a car. Poznan is just a 2,5-hour drive from Berlin airport.
Second, when searching for a hotel I would use Google Maps and search for Poznan. I suggest looking for an accomodation in the surroudings of Poznan (circa 40-50 km from the city). Just insert "hotel" into the search bar and Google Maps will do the rest of the job... Local tourist board claims that in Poznan and near the city there are approximately 65000 (!) beds (different prices, different standard). Look for cities like Swarzedz, Kornik or Steszew which are within 45-60 minutes' driving distance from the city center. When You have a car that distance should not be a problem. Most expensive hotele in Poznan will charge You even over 750€ per night! But don't worry - You are going to find a room for one tenth of that price! And besides, food here is quite cheap. Main course in the tex-mex restaurant will cost You 4-6€ and 10€ will be enough even in the regular restaurant. A half-liter beer in a pub (try Brovaria in the Old Market!) will be just 1,5-2€. And You will find plenty of free hot-spots in the city (every shopping mall offers at least one free hot-spot).
Third, when You use a smartphone (and are ready to cover extra expenses for the data transfer) consider downloading the following applications:
JAKDOJADE - a very pratical app to plan Your tips within the city (local transport), as an alternative You might need TRANSPORTOID (the advantage of which is that You can download a timetable for Poznan and Gdansk before flying to Poland)
YANOSIK or KORKOWO - when You are going to drive a lot. It needs built-in GPS to operate but gives You a real-time info about the traffic.
MOBILET (it works on nearly every mobile phone) lets You pay for a parking ticket (in the city center) and also for local transport (buses and trams).
Last but not least, try http://www.poznan.pl/mim/public/main/index.html?lang=en for the best tourist information You can find about the city.