There is nothing similar to AOL in Monteverde, at least on as large a scale. Most properties are tiny. Remember that this area is forested and has developed much more recently for tourists.
I recommend Los Pinos. It does sit on a large property with its own trails. You get your own cabin with a full kitchen and access to the onsite hydroponic garden for produce. The staff is extremely knowledgeable, communicative, and helpful. There's a lot of wildlife surrounding the cabins,
You cannot get closer to Arenal volcano than AOL. You will be less than 2 miles away from it. Depending on the Room category and specific location, you might have a spectacular view of the volcano (when it is not covered by clouds) and the surrounding green landscape, with flowers, multiple birds and some other wildlife (coatis, etc.) visible from your balcony. Own trails, incl. the waterfall one, make it easy to enjoy the stay there, too. Is AOL not available for your dates?
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In Manuel Antonio, our favorite is Tulemar Bungalows. The beach is right there, service is great, and we saw lots of wildlife on site including monkeys and sloths. Lots of choices for accommodations. We liked having a frig to keep breakfast items on hand and keep drinks cold. Several good open air restaurants in walking distance.