We only stayed one night at Nature Walk, but it was quite pleasant. We had to walk up a number of stairs to our room which was made easier by the porters carrying up our luggage. Our room was adjacent to the dining areas which was at first concerning, but turned out to be very convenient and pleasant. Everyone cleared out well before bedtime.
The view in the morning was tremendous! It overlooked the city and some of the jungle as it ran down from the hills. It was a pleasant surprise to watch a group of monkeys migrate up the hill and try mingling with the guests. Fortunately, the hotel staffs a couple of guys to spook them away as they could be a nuisance if allowed in the dining area. Fun to see them playing and eating some nearby flowers.
One oddity about the hotel was the wi-fi. It worked everywhere in the hotel except our room. Strange. And like most internet access in Sri Lanka, it was not terribly fast.
Overall, a very nice place, safe, quiet, and well worth the money.