Avantgarde Hotel Istanbul has a health club , an indoor pool , a spa tub , a steam room , and a sauna . The onsite spa at this property offers massage and treatment rooms , facial treatments , and body treatments . Business amenities at this 4.0-star property include a 24-hour business center , complimentary wireless Internet access , meeting rooms for small groups , and business services . Avantgarde Hotel Istanbul has a restaurant , a bar/lounge , and a coffee shop/cafe . 24-hour room service is available. Event space measuring 4140 square feet consists of a ballroom , exhibit space , conference rooms , and banquet facilities . The staff can arrange tour/ticket assistance , wedding services , event catering , and dry cleaning/laundry services . Additional amenities include a fitness facility , a business center , and a children's pool . This is a smoke-free property . A total renovation of this property was completed in April 2010.