I stayed at this hotel for two nights in mid-September 2019.
This is an older property (opened in 1972!) but it is very charming and has beautiful grounds. The staff is exceptionally friendly and helpful.
My room was fairly comfortable, although the mattress was a hard foam -- definitely not a Western 5-star hotel mattress. I like harder beds so it was fine. If you don't, you might be unhappy.
Breakfast was included and is a nice buffet with a good combination of Eastern and Western choices.
I would say my biggest complaint was the mattress and lack of outlets in my room to charge my devices. There was only one outlet that was readily accessible, and then another behind the bed that you could access if you worked at it (move the bed, plug in device, move bed back).
The bathroom was also quite small. If you're bigger than about 6 feet or 200 lbs you will feel cramped.
Another oddity was the deposit on check-in; it was 3000 PHP and you can pay it with a credit card but the front desk told me it takes up to 2 weeks to refund it and suggested that I use cash instead. It was only $60 USD but I didn't like the idea of the charge lingering on my card for 2 weeks so I chose the cash option. They gave me a hand-written receipt, and when I checked out gave me back the cash. A little bit odd, but fine.
Overall, despite this nit picking, I was happy with the experience. I would come back to Montebello.