First off, there are no charging points inside. So Spartans, charge your batteries and carry an extra battery backup with you. For tonight you DO NOT take the upper left sleeper seats, the single ones. They are tiny, made for midgets and not for normal people. Also remember to carry a water bottle with you.
Lower seats are fine. You can also get up and sit which is not at all possible on the upper seats.
Also, assume 1 or 2 hours delay. The bus reaches Mumbai by 11 and Pune by 3.