ultra-modern
opposite to old-fashioned
messy
dirty, untidy, or disordered condition
cosy
comfortable and pleasant, especially (of a building) because of being small and warm; nice
airy
spacious
quaint
attractive because of being unusual and esp. old-fashioned
impressive
evoking admiration through size, quality, or skill; grand, imposing, or awesome
open-plan
an apartment without many walls
cluttered
untidy, not organized, and covered with a lot of things
soundproof
preventing, or constructed of material that prevents, the passage of sound
shabby
in poor condition through long use or lack of care
bright
sunny
bare
without much furniture
cramped
limited in the freedom to move because there is not enough space (possibly by too many things inside)
sparsely decorated
not much furniture in the house