I like the workbooks that accompany The New Cambridge English Course.
I think they cover various aspects of language and skills: vocabulary, grammar, phrasal verbs, reading, writing and even listening (in which case students would also need a cassette).
I think they fulfil the criteria you mention: user-friendly, practical and they cover the basics. There are exercises you can do in class and others students can do alone for homework.
You could also consider the English File workbooks.
Good luck and best wishes