This set of rooms sounds charming (5)
I believe the answer is:
suite
'this set of rooms sounds charming' is the definition.
'suite' can be an answer for 'set of rooms' (I've seen this before). I'm not sure about the rest of the definition.
'this set of rooms' is the wordplay.
'this set' becomes 'suit' (I have seen 'Set of garments' mean 'suit' so perhaps 'set' could also mean 'suit').
'of rooms' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'suit'+'e'='SUITE'
Can you help me to learn more?
(Other definitions for suite that I've seen before include "Set of rooms; retinue" , "Train; set of rooms" , "Adjoining rooms" , "Musical composition" , "Set, e.g. of furniture" .)