As you can understand it's very difficult to give a price on a repair without seeing it, as every bike and job are always different, but here is a general list of prices that will give you an idea ....
General service €50.00 ( this includes, truing, centering and tensioning of both wheels, lubing of all cables, quick clean and proper lube of drive train, inflation of tyres to correct pressure, complete re-setting of brakes, gear hanger alignment and proper adjustment of gears, wheel cone, headset, bottom bracket adjustment and finally a safety check of all nuts bolts etc. )
Deluxe service €80.00 ( as above but with all cable inners and outers changed )
Brake service €30.00 ( truing, centering and tensioning of both wheels, lubing of brake cables and complete re-setting of brakes )
If brake pads are needed with any of the above add €10.00 ( price only refers to rim brake pads, x2 pairs )
Internal geared hub service, from €30.00
Wheel build from €60.00