I did a long trip report for the local bike club newsletter, which you're welcome to if you want. Its on a Word document - if you want it, just PM me your e-mail address. 
Dont be put of by the place, the lake district in the north east is great as are the mountains in the south. The old ex state run hotels rip you off but the smaller places can be a real bargain. Try visiting Pension teresa in the lake district. I followed a recomendation off this forum and had a great break there. I didnt bother with the stress of sorting a visa for kalininangrad, no one has a good word for the place.Take time to see poland, its not a shithole and is a worthy destination. (I didnt rate latvia,or was that lithuania? I forget.)Dont bother about a map, they are building roads over there so fast they are all out of date. I bought a small map at waterstones and it was fine. Pay attention to road works signs, especialy in latvia, they just dig the road up and run you for miles on base coat. I saw a sign but no road works so i barreled over a brow of a hill and there was no road The abs definately works!
There is a new section of toll motorway (see pic) on the way to Warsaw almost empty, good for eating a few miles and as good as any roads anywhere. Like most cities Warsaw at rush hour was grid locked and a GS loaded is a pig to filter. Once out of Warsaw the traffic was not to bad but still need to be careful. Border crossing Germany/Poland more or less a wave through, both Lithuania and Latvia borders minor stops but both checked the bike chassis/frame numbers against the reg docs so check they match your self before going, in fact check all your paperwork yourself before going. Are you stopping in Vilnius? Can recommend a good place to eat there are two prices on the menu normal portion and holy sh**t portions just make sure you’re hungry and the beer is good and cheap. Road from Latvian border to Riga was just a collection of short tarmac strips connected by road works last summer but probably ok this year. Have some hotels, maps, Garmin routes etc if you need anything also have a friend in Vilnius who would be glad to help and may be go for a run to Trakia Castle if you have time.
