

Things that someone might look for: shops, restaurants, vending machines, benches, trashcans, water fountains.
To make the map appear a lot more beautiful and complete: map parks, playgrounds, dog parks, sports pitches, etc. as areas; map any fences, walls and gates around and within them. Lots of playgrounds are just mapped as nodes, so if you find such cases, fix them.
these guys are doing Notepad++ in Qt: https://notepadqq.com/s/