Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great book

Really good book which vividly takes you into the life in 11th century Constantinopel.A great and important story about the last great Viking, Harald Hardrada which is recommendable for everyone With slightest interesst in the two mentioned subjects.It is a big book, it presents a story of warfare, love and lots of politics, maybee a bit to much of the last which is why i cannot give all 5 stars.Read it!Also, first time i bought a used item and I will not be as " nervous" next time..