During 5 years I spent a lot of time with an entry level Japan built classical concert guitar, 4-8 hours almost daily. Unfortunately my fingernails, or specifically one of them, doesn't meet standard requirements for complete mastery of some of the advanced techniques. I've since sold that guitar and picked up a few cheapos along the way which I don't use anymore.
I was always keeping an eye open for a small nylon stringed guitar, travel friendly sized, but with a full sized fret board. Now when I only play sporadically, I layed eyes on the Martin Backpacker online. According to reviews the "classical" version is the one that's any good at all, rather than the steel stringed. I knew which one I wanted anyway and bought it off ebay recently. Just letting anyone looking for something small and nice, that this one is very small, and very nice too, certainly for its size but not a toy any which way you look at it. Fit it with a quality set of light tension strings and it will sing. What you could replace is the stock saddle bone which is micarta, with a cow bone.
I won't resort to tying the strings traditional style on this guitar; it really needs the acute angle or projection will drop dead. For the sake of angle, I don't find the action particularly high, and I've been used with low, but can say that there's not much to play with if you want to lower the action yet retaining sustain and projection. Very narrow sweet spot. The stock ball-end strings of course give the acute angle, but better yet your favourite matching strings simply knotted at the end and looped through a flat and tiny single hole drilled piece of bone behind the saddle.
The usual caveat against it is the shape which allegedly makes it darn impossible to actually play. To which I say shaddap and get a clamp style guitar support, then replace the rod with a longer one. Too easy really, and that kind of support folds to store anywhere, easily in the Backpacker's case, and IME it's one of the most comfortable to boot.
The top is spruce so it will have a certain rawness to the tone in the beginning; the burn-in or rather break-in is very real, yet it's got sweet sounding treble even right out of NIB with stock strings, and considering its diminutive size, satisfyingly present bass. It won't work a concert hall but small parties and campfires [tick]; hotel room [tick]; hand-luggage compartment [tick].
If you tried the steel stringed version and didn't like it (I haven't had the chance though), for the travel factor if nothing else, give the classical a strum even if you otherwise don't usually consider "nylon".