I’ve made 17 total flights in and out of TXL and SXF in the last 12 months, and while I agree that SXF is terrible (it reminds me of Nairobi airport), I like TXL. I prefer both TXL and SXF to London Luton, and TXL alone to London Gatwick, London Heathrow, and London Stansted. I find TXL about equal to London City.