The Speaker’s set of rooms is very nice (5)
I believe the answer is:
sweet
'very nice' is the definition.
(sweet can mean pleasant or adorable)
'the speaker's set of rooms' is the wordplay.
'the speaker's' shows a homophone (sound like) (I've seen 'of the speaker' mean this (how the word might sound when spoken)).
'set of rooms' becomes 'suite' (I've seen this before).
'suite' is a homophone of 'SWEET'.
'is' is the link.
(Other definitions for sweet that I've seen before include "attractive" , "Like sugar, honey etc." , "Sour companion" , "Kind" , "Toffee, e.g." .)