The 30 second wait thing to 'prepare the environment' is annoying. I uploaded a file w/prolly no privacy to gosh only knows what. I had hoped to import a CSV into Excel, but wasn't seeing a way to do it.
Create and edit DOC, XLS and PPT files with an Office Suite online
OfficeWork is an office online suite that provides a Document Editor, a Presentation Editor and Spreadsheet Editor where you can perform editing operations like in any desktop editor over documents, excel spreadsheets and powerpoint slides using various file formats
Its main features include Owncloud app integration, multiple file format support, page formatting, color scheme change, text editing features, slide parameters, collaborative document editing, and more