I recommend a Macbook. macs are easy to clean and dirt is not a major problem. You can use Windows if you need it for certain programs.
Macs are really easy to use and you should have no trouble switching to it whatsoever. Everything works in almost the same way and some things are even easier to do. Also it is very safe to use a mac because you can surf the internet without the risk of getting infected with viruses or spyware. Keyboard is not really the most important thing you should look for in a computer.
The MacBook is extremely reliable and it should work fine for at least another 6 years. PC laptops do not last as long unless they cost a lot which you do not want. The Dell laptops have a high failure rate and you should not expect any PC laptop to work for as long as a Mac. The life of a PC laptop is usually around 3 or 4 years while mac can be used for 6 or 7.
In our school we have 6 year old Apple laptops and they still work. My PC laptop broke down after 4 years.

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