Hey there! Over in /r/LearnIcelandic a few weeks ago I answered a similar question to yours:
>I suggest Routledge's Colloquial Icelandic &/or Hippocrene Beginners: Icelandic. Colloquial Icelandic is probably the better of the two since it guarantees that you will achieve level B2 on the CEFR scale where with Hippocrene there's no guarantee, but it's still worth picking it up. Also if you have Skype feel free to join the Icelandic Skype group that I set up. :)
You can check out the original comment in full here, hopefully this helps :)