Here are recommended hotels that are within or a short ride/walk of Singapore’s Central Business District (CBD — Raffles Place / Marina Bay / Tanjong Pagar / Shenton Way). I list address / neighbourhood and a quick note about how close they are to the CBD or an MRT station.

• Marina Bay Sands — 10 Bayfront Avenue (Marina Bay). Iconic luxury hotel on Marina Bay with direct access to Bayfront MRT and the Marina Bay precinct. (marinabaysands.com)
• The Fullerton Hotel Singapore — 1 Fullerton Square (Raffles/Marina Bay). Heritage 5-star on the waterfront; a short walk to Raffles Place MRT and the main CBD towers. (fullertonhotels.com)
• Raffles Hotel Singapore — 1 Beach Road (City/Beach Road area near CBD). Historic luxury hotel a short ride or walk into the civic/business district. (raffles.com)
• Mandarin Oriental, Singapore — 5 Raffles Avenue (Marina Bay). Luxury hotel in Marina Centre with easy access to the Marina Bay/Millennium precinct and short travel to Raffles Place. (mandarinoriental.com)
• The Ritz‑Carlton, Millenia Singapore — 7 Raffles Avenue (Marina Centre). Marina Bay luxury hotel near Promenade/City Hall stations and within the Marina Bay business area. (ritzcarlton.com)
• Pan Pacific Singapore — 7 Raffles Boulevard (Marina Square / Marina Bay). Large business-friendly hotel beside Marina Square, convenient for Suntec/Marina Bay and the CBD. (panpacific.com)
• Swissôtel The Stamford — 2 Stamford Road (City Hall / Raffles City). High-rise hotel above City Hall MRT, within a few minutes’ public-transport ride to Raffles Place and CBD towers. (en.wikipedia.org)
• Oasia Hotel Downtown — 100 Peck Seah Street (Tanjong Pagar / Downtown Core). Contemporary hotel located in the Tanjong Pagar CBD cluster; very close to Tanjong Pagar MRT. (oasiahotels.com)
• PARKROYAL COLLECTION Pickering — 3 Upper Pickering Street (Downtown / Chinatown). “Green” boutique-luxury hotel a few minutes’ walk to the CBD and Chinatown/Clarke Quay. (panpacific.com)
• Amara Singapore — 165 Tanjong Pagar Road (Tanjong Pagar). Mid-to-upmarket hotel on the edge of Tanjong Pagar/Chinatown within walking distance of the Tanjong Pagar CBD area. (singapore.amarahotels.com)

If you want a shorter shortlist filtered by budget (luxury / mid-range / budget), or rates and availability for specific dates, tell me the dates and your budget and I’ll fetch current options and prices.