Outcall means the therapists come to the room the two of you are staying in, anywhere central in Amsterdam, since the house keeps no studio of its own.
Couples looking for a spa usually expect to go somewhere. Here the direction runs the other way. The house has no premises to visit; its forty-five therapists travel to the address you give, around the clock, and a couples booking simply means that one or two of them make that journey together.
A couple hosting two therapists needs a little more space than a solo guest hosting one. A standard double hotel room works, especially if the bed can be used and a chair moved; a suite, a canal-house apartment or a short-let flat gives more room to spread out. What matters is that there is space for two people to be looked after at once and a door that closes. For a sequential booking with one therapist, any ordinary room will do. Practical notes are in the guide on setting up a room for two therapists.
Outcall covers hotel rooms and private addresses equally. Couples in hotels do not need to tell the front desk anything beyond what any guest expecting visitors would. Couples in rental apartments should give the full address, the floor and any buzzer name in the first message, because a pair of therapists standing at the wrong door costs the whole evening several minutes. The guide on couples massage at your hotel covers the hotel side.
Outcall runs across central Amsterdam, from Centrum and the Jordaan out to Oud-Zuid, De Pijp, Oost and Noord, all at the same price with no travel charge. Hotels at Schiphol and around the airport are possible by arrangement, and those bookings always carry a deposit. The house does not travel to other cities, so a couple staying outside Amsterdam should plan the session for a night inside it.
Timing is uniform too. The arrival window is the same anywhere central, whether the two therapists are crossing the IJ or walking a few streets.