Price seems about right to me, assuming it's from a trader. As a comparison, a local trader has for sale a W203 C220 CDI Sport 2006 (06 reg) 87,000 miles, FSH for £7.295 which
is a little over priced to my mind.
The one you've posted pics of looks as though it has factory tints, same as my W203.
Don't be fooled by the 'Telephone' buttons on the audio and steering wheel. All these models have them (cost cutting exercise I think) but not all have the necessary pre-wired installation in the armrest. That one doesn't have it. The way to distinguish is a small aerial on the back screen and an additional side opening section on top of the centre armrest, where the bluetooth adaptor plugs in.
There were several wheel size options on these cars, both diameter and width, mine has the staggered 17" wheels, (Adharaz, the same as in your pics) 7.5J front & 8.5J rear, but there was also the option of 7.5J all round I believe.
One thing to check is to make sure the engine reaches normal operating temperature 80º+ fairly quickly. I would think you know that diesels take longer to warm up that petrol engines though. Failed thermostats is fairly common on these.
Mine doesn't have comand (built in sat-nav) but I think TomTom are a much better option anyway.
Also check all electrics are working and no error messages in the dashboard display. You can also check when the next service is due, by scrolling through the menus using the steering wheel buttons.
I do my own oil and filter changes, etc., and it's straight forward and easy enough, as is replacing brake pads, discs etc. Just one thing to note, these cars don't have a dipstick, the oil level is checked electronically using the steering wheel buttons. Engine oil needs to meet the appropriate MB Approved specs.
There was also an optional 6 disc CD multi-changer available for the standard Audio 20 and is fitted in the glove box.
If you want to familiarise yourself with any aspects of the car before viewing it, this may help... it's the USA version of the handbook, but will be similar to the UK one, although it doesn't cover diesels.
https://www.mbusa.com/vcm/MB/Digita...30_c280_c350_c230c350sport_c280c3504matic.pdf
Hope this helps and doesn't confuse you.