You should choose a house with robust window bars or have them installed. Your door should be fitted with a modern array of locks. You will need to ask your helper about this. Some styles of lock are problematic if your key breaks inside it, as some are prone to do. Also make sure you change the barrels or combination. Your door could conceivably be used to lock you inside. Some lock designs can be circumvented silently within seconds. Check your lock design for these peculiarities.
You are very unlikely to be accosted on the street, but be wary, especially of pickpockets.
Be sensible in some of the more popular taverns, where fights and sometimes injuries occur. Some men and women there are armed with knives. Don't forget though, you are a welcome guest here and the likelihood of your being assaulted in one of these places is very rare and will probably equate to the amount of offense that you gave, but not necessarily.