This book deals with a hard subject, but every effort has been made to explain and motivate the ideas involved before they are dealt with rigorously. Often done with simple examples, this gives an opportunity to get comfortable with them first and makes this book about as readable as a book on algebraic topology can be.
It is a good textbook, with intuitive motivations and lots of examples. However, I think there are better alternatives--Rotman, Dold, May, Spanier, which are clearer in terms of organisation. It is still a great book for the wealth of examples.