Bathroom tiles need fixing

The tiles are falling of in my bathroom in some places. I’m looking for a skilled person who can fix them for me and also look after some wetch patches on the upper bathroom wall which may need professional “drying” (the wallpaper is starting to crumble in some places and will need to be replaced as well). I am not certain what the cause for that may be – maybe a leaking pipe or just the overall condition of the wall (we are living in an old redbrick building, and the bathroom wall is in the north-western corner of the house)?