This is a good book for the person who has some knewledge of the language and wants to learn more about the general aspects of grammar, it consists just in the necessary rules, it isn't a conversational or a deeper grammatical treatise.
The only objection I have to it is that still uses the old orthography prior to the '80s reform (three accents, two breathings), but if you know how to make the right changes (just one accent, the acute, no accent in the monosylables, except as a diachritic, no breathings) there will be no problem at all.
For that price, a very good adquisition.