Can a noun with the locative suffix be followed by phrases with their normal agreement markers? For example, is this correct ...
Hawatalala chumbani cha mgeni.
"They will not sleep in the guest room."
no, the -ni will move it into another class, so it would be:
Hawatalala chumbani kwa mgeni. au: Hawatalala chumbani pa mgeni. (You could even use "mwa" as it is inside somewhere)
They will not sleep in the guest's room.