The Virginia Residential Landlord Tenant Act (VRTLA) applies to most apartment complexs in Reston (it sounds like you're in a complex).
Assuming VRLTA applies--LL has responsibility to act. However, you have responsibility to notify LL in WRITING. If you've not yet done so, dash off a letter immediately. Send it certified mail.
Know that the law allows LL time to cure the defect before you can justifiably take action.
A smoke detector would be considered an emergency by the court and would have to be corrected immediately. A mouse/rat/bed bug matter MIGHT be considered an emergency, but most likely would not--LL MIGHT have as much as 30 days to act/eradicate depending on whether health issues are involved.
You do have the option to withhold rent by establishing an escrow account with the General District Court--your rent would be paid into that account and LL cannot get the money until the court determines he/she has acted properly. However, the court will not let you open that account until you've notified LL in writing and he/she has been given time to act.
Finally, absent other facts, Friday does not seem unreasonable to my eyes--your post having been made on Wednesday.
You don't need a lawyer to file the Tenant Assertion--you can do it yourself.
Attached is a link for the VRLTA-http://www.dhcd.virginia.gov/HomelessnesstoHomeownership/PDFs/Landlord_Tenant_Handbook.pdf
Check out the bottom of page 29 (§ 55-248.25. Landlord's noncompliance as defense to action for possession for nonpayment of rent
(1) write that letter and start the clock ticking
(2) consider filing tenants assertion IAW sec 55-248.25 if LL fails to act
(3) if you have damages resulting from LL failure to act, consider negotiating with LL a break on your rent for some period of time--or sue for it if you feel strongly you have significant damage that needs compensation.
I am licensed in the Commonwealth of Virginia, answering your query and my answer do not create an attorney-client relationship and I am not providing you legal advice. You should speak with an attorney to whom you have provided all the facts, before you take steps that may impact your legal rights--or rights to recovery of damages. I wish you the best of luck with your situation.