Recently finished a seven night stay over the holidays. Ended up using my remaining SNA and was upgraded to a high floor 1 bedroom executive suite (same as the post above). Seems like they proactively upgrade most platinum guests if a suite is available. Seems like only the lower third of the hotel has been renovated. You really want a high level room as the noise from the street is quite noticeable. They provide ear plugs, but they aren't needed above the 20th floor. The service at the hotel was exceptional. Most hotel staff were smiling and would greet you by name. We've visit Lima about once a year and have stayed at a number of hotels in the area and overall the JW has the most convenient location and is now our favorite. We had an early morning flight and they did a very nice boxed breakfast for us to take to the airport for our platinum breakfast.
One thing to note is that the hotel currently uses a $1 to 4.1 soles conversion rate. If you booked a cash rate they will convert your rate from USD to soles, which bumps up the price by ~8%. Otherwise, you will have to specifically ask that they charge you in USD. For all other incidentals they will accept USD which would provide an ~8% discount or you can pay in soles on your credit card.
The executive lounge has been downgraded. There is no all-day alcohol. In fact, the only alcohol provided is three house wines (fairly low quality) from 7pm-9pm. There was two hot food options during those two hours and soup. The quality of those were usually quite low as well. The lunch and dinner food options had mostly cold items (salad, finger foods, and sweets). We found that we mostly used the lounge for their fully automatic espresso machine, water, and sodas.
After the 5th night, housekeeping started to put small gifts in the room which was a nice touch. The 1-bedroom suites are provided with bags of salt from Cusco for the jacuzzi and a special "pillow mist" on the bed. Massage prices at the spa are $63 for 50 minutes and $126 for 100 minutes. My wife and I had several during our stay and they were excellent.
We had just come from the Andaz Mayakoba where the buffet was large, but the quality of food was slightly below mediocre. The breakfast buffet at the JW had much higher quality food. Room service was never bad, but sometimes it was great and sometimes it was mediocre. Lomo saltaldo and Wagyu maki were excellent, maki acevichado was average, and Amazonian ceviche slightly below average.