Update on Santiago Marriott
Stayed for 4 nights on 2 stays over New Years. Got a good rate on a Business Suite for US$160 including breakfast, lounge access, and the use of a wireless modem. Hotel is as described in the thread...new, nice, walking distance to mall and restaurants.
Major complaint was the taxi situation. The hotel has its own vehicles and the will not assist you in getting a regular taxi. During peak hours this can entail a lengthy wait, usually in a queue with others at the curb trying to flag down a speeding taxi.
We had a 0930 flight out and I asked the front desk at 0600 to call me a regular taxi for 0630. 0630 rolls around and no taxi...front desk never called. Wound up paying CLP20,000 (about US$40) to use the hotel service, negotiated down from the list price of CLP27,000 (!). What a rip-off.
Normal taxi from the airport should run about CLP10,000 (US$20); after the bad experience departing the first time I booked a roundtrip limo from one of the operators at the airport for CLP16,000 each way for our second stay.
I don't mind hotels which offer limo transfers at a premium price, but a place that won't even help you call a regular taxi (when there is no taxi stand nearby) is really annoying. Only blot on an otherwise enjoyable stay.