My charming tiny apartment is in Montmartre, just in front the Sacré Coeur and very close to Pigalle (Le Moulin Rouge ...). It is perfect for couples and solo travelers. The bathroom is small and there is little storage space.
By the way, I can show you few nice places !
The neighborhoods are very dynamic: bars, restaurants, concert halls, cinemas, museums. Romantic walks.
Abbesses (ligne 12)
Anvers (ligne 2)