You should try PitStop which is over the road from the main internet cafe (easy internet or something).
Pit Stop Restaurant & Garage (M Carian Ltd)
+233 (0)21 222 944
0830 - 0000
Sat until 4pm
Degrees minutes seconds - N5 34 10.0 W0 12 18.8
Decimal minutes - N5 34.167 W0 12.313
Full English Breakfast 70,000 Cedis (approximately £4.27)
It's owned by Ian Webster (also called M. Carian Ltd or 4QBar): 222 944 or 024 2777 722.
They replaced the timing belt in my 300tdi and did a good job with the work. I was there in Sept 2004.