Can a Taxi in Beijing accomodate 4 persons with two suitcases?

Yes! You can take a regular taxi to the hotel. Each taxi can hold four passengers at most, and you can put the suitcases in the trunk. And generally speaking, there will have enough space to put the luggage on the taxi. By the way, the fare may be around CNY90 in the day time. The trip takes about 40 minutes.