My wife have the similar model, I clean it up once per 2-3 years. the holding screws are not standard, you should be aware.

Not good idea to go BIFL. Newer models are way quieter and more energy efficient. Better to go cheap and change each 4-6 years. Some companies in EU offer 5 y. warranty.

One unit of high class Daikin cost around 2X middle class or 3x cheap ACs. I got 4x Daikin on my mountain house. The first one is bought 2008 and still work flawlessly. One of the 3 newer ones bought 2017 died last year. The compressor change costed like 1 cheap AC.

For my apartment in the city I bought middle class toshiba with 5 y. warranty this summer because the central heating runs on russian gas. I don't expect to last more then 6-7 years. Having single units is a way more energy efficient compared with 1 big AC unit, unless you combine it with water to water heat pump. In this case check the LG models.