You may take it from a most diligent student of Arabic who came to spend a year in Egypt able to read everything including 7-th century poetry and the Qur'an, only to find herself unable to converse with people and understand what the ... they mean - this little dictionary has been a tremendous help to me as it will be to you. Given the shortage of textbooks and dictionaries of spoken Arabic (books by M.Salib and A.at-Tonsi, both from AUC, are to be praised and recommended, but hardly anything else), Stevens's dictionary stands out as one of the most helpful. couple it with a SUPERB Egyptian Arabic-English dictionary by M.Hinds and Badawi (worth any price, more thrilling than any detective story), and you have a fair chance of getting your 'ammiya (i.e. colloquial Arabic) right. Even if you're not planning to invest much time in it but are only going to spend a few weeks in Egypt, still it is worth having.
More to the point: it covers practically all the words you need; transcription is accurate, simple but not oversimplified, as is the case with most phrasebooks that will get you just nowhere. Last but not least: it also contains essential bits of colloquial grammar (which is rather simple, so no need to fear).
Good luck!