Rachel Hoff (from the Pencil Princess Workshop) is committed to quick, careful, considerate critique.
I typically offer a full-service edit that focuses on getting a piece of writing ready for publication. This involves a bit of content editing, a bit more line editing, and a copy edit. I am occasionally also willing to help with formatting for Kindle or E-book.
My content editing is light. I'll mention continuity problems. (For example, if the character was wearing a red shirt a page ago, and now she's wearing a blue one, but she hasn't changed clothes or had a scene break, I'll pop in a comment noting the issue.) Similarly, I'll comment on factual errors. (Sorry, but I don't think people can see the Golden Gate Bridge from LA.) I'll also comment on things that seem unrealistic or confusing. (How exactly did she punch him without dropping the carton of milk, lunch meat, and cheese that she'd just pulled from the fridge?) These suggestions will be in comment bubbles, not the actual text.
I don't typically comment on overall plot structure or character arcs unless an author has specifically asked me to do that, or the plot/character has taken a turn that seems completely out of place for them or for this story. If an author would like a more significant content edit, they should let me know (and plan for at least two editing passes, to bring a fine polish to text that has significant changes).
Line editing involves cleaning up unclear or clunky phrasing and pointing out style issues like cliched phrases, mixed metaphors, and overused or repeated words and phrases. Usually, these issues will be highlighted, and suggestions will be in comment bubbles, not the actual text. Sometimes, for awkward sentences, I'll offer a couple of alternatives that flow better. (Authors sometimes choose one of these, and sometimes choose an entirely different way to solve the problem.)
Copy editing cleans up grammatical errors, misspellings, typos, and other picky little problems. I usually correct these in the text, marking the changes so that the author can accept or reject them.
I prefer to work at a per-word rate of 1/2 cent (US), but am open to negotiation, especially for those who would like a long-term working relationship.
Since finding an editor that works well with one's own writing style and process can be a tricky thing, I am happy to do a free sample edit of up to 1/10th the size of the project or 2000 words, whichever is smaller.
My favorite genres (to read, write, and edit) are YA of any kind, fantasy, science fiction, historical, and sweet romance. I also have a soft spot for anything with immigrant or cross-cultural themes. If you have a project that fits any of these categories, I'd feel privileged to work on it with you.