Park Plaza's location, is just as ideal as Orly's. They're only 2 short block apart. Providencia is an ideal location, as they are pleanty of dining alternatives, shops and subway near by.
Both hotels are on important secondary streets, near Providencia Ave with certain amount of traffic. However, if Im not mistaken, Park Plaza has sound proofed windows.
Hotel Orly is a small quaint property, that has received some very good reviews here at Trip Advisor, mainly due to their service. However they lack onsite services such as a gym and pool.
Park Plaza is a larger hotel, (still only 104 rooms) with amenties and customer service that you'd come to expect in a 5 star hotel.
Thanks for your feedback. Its a big help in giving me my bearings.