I am going on an Alaskan cruise the end of July and it ends in Seward. Can anyone recommend good accomodations in Anchorage and Denali NP near the train station?

Whatever you decide, don't delay. Many of the accomodations will fill quickly if they have not already. That's peak season and there are 10's of thousands of people making the same arrangements you're making, sailing on dozens of vessels. With Alaska, planning ahead is very important!

Cheers, Neil