I don't normally write hotel reviews but felt obligated to weigh in on this one.
After I paid for 5 nights online and then a 6th in cash, the night clerk (presumably the owner) charged me for two more nights as I was checking out. He claimed that I did not return the key card for room #2, even though my friend who stayed in that room was clearly gone after the first night. While no ID or credit card was used to procure the second room, somehow it was still tied to my name. Though I respectfully explained the situation, the manager refused to acknowledge my position and the armed guard at the front door prevented us from leaving to catch our flight until I paid the additional fees.
Overall, Adriatico Arms offered a decent room for a reasonable price, located in a very touristy part of Manila. Most of the staff was friendly and the amenities were fine. There were plenty of restaurants and bars within walking distance, including a relatively nice one attached to the hotel. Nonetheless, there are at least 20 similar establishments within a few block radius that all offered the exact same thing, so don't feel obligated to settle with one that will charge you for nights you don't use.