Just thought I'd add my experience of cleaning quotes to this thread...
We have 135m-sq 5.5 room apartment with cellar and 8m of floor to ceiling windows, 2 balconies and other big windows, laminate/tile floors throughout - no parquet or carpets. Circa 20min (train/car) outside of Zurich. I got 4 quotes all including a guarantee.
these ranged from 1350chf to 1850chf.
1 company didn't visit to quote just asked for details - their quote was 1550chf.
The company that quoted 1850 specified certain things (such as polishing - not just mopping - the laminate) would not be done i that quote & gave a separate price foe if these things were done. If all these things were requested it could have topped out 2300chf +
Needless to say as all include guarantee we went with the cheapest.