Monaco has a small selection of hotels with many of them being in the uber-luxurious category. One or two budget options do exist, but you may need to nip over the border to France to find something which offers better value for money.
Le Quai des Princes Apartment Residence, Cap d'Ail
Built right up against Monaco, looking onto the superb marina of Cap d'Ail, the aparthotel offers 31 spaceful and bright suites-apartments where the lapping of the sea will be your music.