The Residence Inn is situated a little way south of Downtown Long Beach, across the Queens Way bridge but finding it can be problematic if you try to reach the location from West Ocean Boulevard. It is close to Hotel Maya so if you can find that place, you are almost next to the Residence Inn. It is well worth the effort of a little careful map reading, though, as it is a good value, comfortable hotel with very friendly and welcoming staff. (Taxi drivers and the LAX shuttle buses find the Residence Inn without difficulty.)
The rooms are well-equipped with kitchenette, sofa, dining table, roomy showers etc and there are guest laundry facilities, a small gym and an outdoor pool. Whilst there is no restaurant, the complimentary breakfast offers a good variety of tasty food to start your day and there was a barbecue evening on the Wednesday of my stay.
The hotel is served by the local free Downtown Passport bus service which runs approx every 25 mins and will take you to the World Trade Centre, the Convention Cenre, the Aquarium and various other places. (The timetable says every ten minutes but that wasn't my experience at all!) However, because of the one-way road system which makes it hard to find the hotel, a return journey from the World Trade Centre takes three different Passport buses. I found it easier to walk back (25 mins) once I'd identified a route with sidewalks.
There are hotels closer to the World Trade Centre but my colleagues who stayed there were not impressed, so I would certainly stay at the Residence Inn again if I return to Long Beach in the future.