I'm a huge fan of the mood and themes in the Ravenloft setting, so when I saw this adventure I bought it right away.
Visually, it exceeds most comparable products published on DMs Guild, but it's not quite professional quality. The cover itself is intriguing, but inside it's lacking. The layout is fine, but the art varies in styles and quality. There are two maps included: One is a hex map, but as there's only three areas of interest, it's not particularly necessary. The other map is a simplified version of the same area, but meant to be someone's scrawling in the dirt. It's a good reference for the DM to have, but it's... very ugly. There are adequate pictures included for most of the NPCs, but strangely not for the central NPC that PCs are sent to find.
Some Spoilers Follow
The first chapter (two pages of material set in a small village) has the makings of an interesting adventure. Mostly, the PCs are making ability checks related to investigation as they poke around the village. There's a fun bit of foreshadowing between a song sung in a village tavern and the lingering scent of rose perfume in several areas. Only elves and half-elves get a check to notice the latter, which seems like a mistake; between parties that don't have elves or half-elves and those where elven character fail the checks, this fun element might get missed. In my opinion, it's a creepy touch and one of the 'gothic-horroriest' things about this adventure. There's a body or two thrown in the mix as well, with prompts for horror checks from the PCs. I'd suggest getting rid of these or at least lowering the DCs, since 3rd level PCs are likely to have seen a bit of gore, but your mileage may vary.
The second chapter (two and a half pages) takes place in a nearby forest. The confrontation therein can conclude a couple of different ways, but ultimately the monster is readily identifiable, since the party conveniently stumbles upon them mid-evil act. A lack of red herrings, other suspects, or interaction beyond running or fighting seems to preclude any possible mystery or chance that the glaistig will get away. Despite the very good chance that the glaistig attempts to run from the party, the adventure tells the DM to 'improvise this chase scene as necessary'. This seems like a missed opportunity to showcase some creativity on the part of the author.
The final chapter (little more than half a page) is by far the weakest of the three. Caitrin, the possessed NPC from chapter 2, gives the PCs this location in what is the thinnest plot point in the adventure. Unless she was possessed immediately after she and Gathan were attacked, I'm not sure how she knows the bard has been brought to a clearing in the middle of the forest. Even if that's the case, her spirit is supposed to be following her body helplessly during the possession. Of course, since Gathan was carried here by a gargantuan forest worm, presumably the party can follow the swath of broken trees or burrowed earth from the scene Caitrin's possession in chapter 2. Plot holes aside, once the PCs arrive, they must make a perform check to rescue the central NPC from the aforementioned worm. There does not seem to be any other means of resolving this scene. The worm's CR exceeds the player's capacity to defeat without some extremely creative tactics (not a problem from my perspective, but might cause some problems with bull-headed characters itching for a fight). Another chase scene will ensue, but again there is no elaboration.
When I run The Charred Rose, I'll remove or rewrite the 3rd chapter entirely. The giant worm seems a little out of place in a horror adventure, and the glaistig is a far more interesting antagonist anyway. The first two chapters could also use some elaboration. Perhaps Caitrin's spirit, not merely content to follow her possessed body, takes some initiative and attempts to warn the villagers, leading to strange incidents of haunting. A couple more NPCs in the village couldn't hurt either; I'd consider setting up one of Caitrin's suitors as a possible suspect for the disappearances.
All in all, The Charred Rose is a short adventure in need of some TLC but with a lot of potential. Worth the price of admission.