Good coffee, cool atmosphere. Arriviste also has comfortable chairs and free wifi, perfect for getting work and studying done. I had their house drip coffee (Commonplace Coffee Mwalyego (Tanzania)) which was good.
Their coffee isn't cheap or very expensive (the menu is on their website). Arriviste is a little quiet, so it isn't too loud for studying but also may be too quiet for a conversation. I would come again :).