Around 1-hour drive to downtown one-way. The cheapest way is the hotel bus which also makes a stop at the city centre and drives not only to the hotels in Miraflores. Lima is only safe (and with the help of a lot of policemen) during daylight.
I used a shared lounge (if I remember correctly: KLM, Lan Chile, Air France, Delta, ...) last year in october. A good selection of beverages and some snacks/small sandwiches. A working/business area is separated, so it's quiet there. As far as I remember, the lounge was smoke free (except the separated working area). No windows/views. I made also a
picture.
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Short overview: KLM FD, LH M&M