As a starting point I imagine an open floor plan with plenty of room between desks, and conference rooms for private discussion. I am interested in private offices but I don't think we'd find affordable space to do that.
Your starting point is my ending point.
Nothing stands in the way of deep focus like open floor plans.
Nothing stands in the way of producing extraordinary results than lack of opportunity to focus deeply.
And nothing stands in the way of being a great place for me to work than not being able to produce extraordinary results.
I would turn your strategy around by first finding proper working conditions for workers (for me, this means an office with a seat facing a door that closes) and only then adding the perks (coffee, snacks, email, vacations, etc.) that don't make any difference if we don't already love our work.