looking for a place to stay in Lisbon

We usually use booking.com to search hotels and contact hotels directly to book.
If you have mobility issues Chiado is not the best area, it's up hill in most areas.
Nearby Baixa is flat and Avenida da Liberdade has a gentle incline.

This is nice https://www.palaciodasespeciarias.com/en/casinhasdelisboa/casinha-das-flores

Casa Do Barao is perhaps the best hotel we’ve ever stayed at in Europe! It’s like an oasis of calm.