I couldn't agree more. I always clean my entire apartment/bathroom before I go out or have a girl over. I keep it a little disorganized, just barely, so that it doesn't look try-hard. But it's always CLEAN - real clean. *Especially the bathroom.*
I can't even count the the number of women who have walked out of my bathroom and flat-out complimented me on how clean my bathroom is "for a guy." I usually just say thanks and change the subject, like it's no big deal. It definitely makes women feel more comfortable. Yeah, I can get laid with a dirtier bathroom. But why not make things easier?
More importantly, you want your guests to feel comfortable, man or woman. That's a bigger picture social-building thing - making people feel comfortable at your home.
And I'll expand on this. Keep your bathroom clean but also make sure that all needs are met. Include a spray in case someone needs to take a shit. Prevents them feeling bad for stinking up the place. Keep tissue paper, so they don't have to use toilet paper to blow the nose or touch up. The trash should be empty, not full of old crap. Hand lotion is something woman love to use after washing hands. But keep lotion that you would actually use, not something perfumey and girly. Same thing with the handsoap. I like to keep something environmentally conscious because I like supporting those kind of companies, but also because women appreciate a man who has consideration for things outside of his own little world. Remember, that the things you keep in your apartment, or bathroom, reflect you. And even if they don't consciously make judgments, there are subconscious thoughts going on.
And when a girl asks to use my bathroom, I always tell her to make herself at home. That way she feels like she can use products without hesitation.
The result is ALWAYS that woman feel super comfortable at my place. In fact, many woman that I have over (even as early as 1 or 2 times) have told me that they feel more comfortable staying at my place then they do at their own own home. I keep around contact solution and cases, even though I don't wear glasses (an ex left them here

Same thing with toothbrushes - I keep extra around. I want woman to have everything they need to feel comfortable to stay late and have sexy time.