Sometimes the catering wasn't the best,leaving an unsettled stomach (or bowels).
Some managers and only a few supervisors are a bit difficult to deal with.
The aspects of the work in another language can be challenging, especially if you have responsibility and there are consequences to a 'misunderstanding'. Finishing late can be a hassle as Lisbon buses tend to wanna have bedtime after 21.00?So how to get home?