I am living in Cairo since 2 years. And its very hard to bring guests- even in my own apartment —because as a foreigner you're given extra protection/monitoring (?)—and I don't want the security guards to become suspicious, especially since in my case they're actual police officers.
That's why I even rent an apartment in Giza in a less desirable area, which is very cheap and, most importantly, has no security guards. Recently, however, the main gate is often locked and there's a doorman. So it's not so easy anymore.
When renting an Airbnb, you should make sure you can check in yourself, either with a key box or a code. If it says "with staff around the clock," it means that there's ALWAYS someone sitting downstairs watching.
When renting an apartment, it's also important to make sure it's not in a compound. This is often the case in 6th of October or New Cairo. I've had good experiences in New Cairo: there are many apartment buildings there without doormen or security. However, these apartments are quite expensive...
I think there are definitely a significant number of guys on Grindr in Cairo. But I'm certainly willing to pay for good-looking and muscular guys.
Some guys are available for visits—but very rarely, and often in very run-down apartments.
I highly recommend "Cap D'Or" downtown. It's a fairly large bar with good music and a very mixed crowd—but almost exclusively gay men and their allies. Recently, you have to reserve a table via WhatsApp (00201287130640). It's sometimes very crowded on Thursdays, so the manager felt he had to implement this measure—we'll see how long he can keep it up. At the moment, he has to close at 11:00 PM anyway due to the energy crisis, so reservations aren't necessary. Even though it's almost exclusively gay men there, it's obviously not a true gay bar. But you can definitely meet someone there! It's a 10-15 minute Uber ride from Zamalek.
In Zamalek, I went to the H2O Gym—in an old, somewhat run-down villa, but it's a gym just for men... and there's a hot tub where you sometimes sit with very hot guys, and as a foreigner, you're usually approached. I no longer live there and now go to the "Transformers - Nile View" gym. Apparently, things get pretty wild in the sauna area at night/early morning. I've never tried it and don't intend to.