Bangkok has a lot of "serviced apartments."
These are condos that have been turned into rentals.
They have kitchens, living rooms and bedrooms.
They are run much like hotels.
Maid service is usually a couple of times a week but you can request daily service for an extra fee.
Many of them have gyms, most have swimming pools and many include daily breakfast
Do a google search for "Bangkok Serviced Apartments"
One I have stayed in several times is
Riverfront Residence Bangkok
I thought their rooms were generous and their prices where competitive.