I'll put one down for MiniVap, seems to fit the description as a glove: Almost NO cleaning! If I am really concerned about it, maybe three times a month? Otherwise just one. I use it twice a day. Its biggest setback depends on how you define portable though... It is the only hybrid device I know of (both portable and desktop, with different connection) but still the biggest one around. As an advantage, well, its a portable with desktop power! Cleaning process is a breeze too, just use a few alcohol swabs. Basket needs some brushing, ~3-monthly brush on heating chamber screen, if any. That's it. Oh, you may need to blow on the bottom screen every few months. Second would be the Milaana. Just a glass tube to clean. Screen works better when half clogged. Extremely simple, but powerful and easy to use. Offered one to a friend and really loves it too. IME Solo required cleaning the oven as well, about once a week. Was very low maintenance apart from that, but still a bit of a PITA, to get it perfectly shiny. If you end up getting this one, just warm oven very gently before cleaning. I found it helped a lot. I also agree Flowermates/Boundless are a good option too, but don't really own those just tried them, so can't speak in detail about them. At the end of the day, you may have to give us more detail regarding the amount of power you want in your portable and/or how much money are you willing to spend? I ordered my answers specifically by how easy they are to clean but that may be a little too restrictive, there's a few differences between all these models besides cleaning, i.e: heating method, etc. But if you went for a DaVinci, I'm guessing you aim for a mid-range electrical model. So discretion is a factor am I right? Maybe even a Pax3 would suit your needs? As long as you clean it regularly, it may not require too much cleaning? Say about once/twice a week by most user's reports on the Pax 3 thread, if I'm correct. As I said we may need more input on your part to be able help you. Best of luck!